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        "abbrev": "\u03c4",
        "formula": "C11H17N3O5",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 271.27,
        "mass_monoiso": 271.1168,
        "mass_prot": 272.1246,
        "name": "5,2'-O-dimethylcytidine",
        "product_ions": "126",
        "reference_moiety": [
            "C"
        ],
        "short_name": "m5Cm",
        "smile": "CO[C@H]1[C@H]([n]2c(=O)nc(N)c(C)c2)O[C@H](CO)[C@H]1O"
    },
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        "abbrev": "F",
        "formula": "C10H14N2O5S",
        "lc_elution_comment": "between G and A (Kellner 2014)",
        "lc_elution_time": "1,36 (Kellner 2014)",
        "mass_avg": 274.294,
        "mass_monoiso": 274.0623,
        "mass_prot": 275.0701,
        "name": "5-methyl-2-thiouridine",
        "product_ions": "143",
        "reference_moiety": [
            "U"
        ],
        "short_name": "m5s2U",
        "smile": "Cc1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=S)[nH]c1=O"
    },
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        "abbrev": "\u2228",
        "formula": "C12H17N5O5",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 311.294,
        "mass_monoiso": 311.1230,
        "mass_prot": 312.1308,
        "name": "N2,7-dimethylguanosine",
        "product_ions": "180",
        "reference_moiety": [
            "G"
        ],
        "short_name": "m2,7G",
        "smile": "CNc1nc(=O)c2c([n]([C@H]3[C@H](O)[C@H](O)[C@@H](CO)O3)c[n+]2C)n1"
    },
    "5": {
        "abbrev": "\u221e",
        "formula": "C12H17N5O4S",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 327.359,
        "mass_monoiso": 327.1001,
        "mass_prot": 328.1079,
        "name": "2-methylthio-N6-methyladenosine",
        "product_ions": "196",
        "reference_moiety": [
            "A"
        ],
        "short_name": "ms2m6A",
        "smile": "CNc1nc(SC)nc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
    },
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        "abbrev": "\u03c2",
        "formula": "C17H23N5O8",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 425.393,
        "mass_monoiso": 425.1547,
        "mass_prot": 426.1625,
        "name": "epoxyqueuosine",
        "product_ions": "295/163",
        "reference_moiety": [
            "G"
        ],
        "short_name": "oQ",
        "smile": "Nc1[nH]c(=O)c2c([n]([C@H]3[C@H](O)[C@H](O)[C@@H](CO)O3)cc2CN[C@@H]2[C@@H](O)[C@@H](O)C3C2O3)n1"
    },
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        "abbrev": "4",
        "formula": "C9H12N2O5S",
        "lc_elution_comment": "between G and A (Kellner 2014, Kellner 2014)",
        "lc_elution_time": "1,15 (Kellner 2014); 1,18 (Kellner 2014)",
        "mass_avg": 260.267,
        "mass_monoiso": 260.0467,
        "mass_prot": 261.0545,
        "name": "4-thiouridine",
        "product_ions": "129",
        "reference_moiety": [
            "U"
        ],
        "short_name": "s4U",
        "smile": "OC[C@H]1O[C@@H]([n]2ccc(=S)[nH]c2=O)[C@H](O)[C@@H]1O"
    },
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        "abbrev": "\u03b1",
        "formula": "C14H21N3O8",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 359.332,
        "mass_monoiso": 359.1329,
        "mass_prot": 360.1407,
        "name": "1-methyl-3-(3-amino-3-carboxypropyl)pseudouridine",
        "product_ions": "228",
        "reference_moiety": [
            "U"
        ],
        "short_name": "m1acp3Y",
        "smile": "C[n]1c(=O)[n](CCC(C(=O)O)N)c(=O)c([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)c1"
    },
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        "abbrev": "\u03bd",
        "formula": "C10H15N3O5",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 257.243,
        "mass_monoiso": 257.1012,
        "mass_prot": 258.109,
        "name": "N4-methylcytidine",
        "product_ions": "126",
        "reference_moiety": [
            "C"
        ],
        "short_name": "m4C",
        "smile": "CNc1nc(=O)[n]([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)cc1"
    },
    "10": {
        "abbrev": "`",
        "formula": "C15H21N5O5",
        "lc_elution_comment": "after m6A (Kellner 2014)",
        "lc_elution_time": "2,59 (Kellner 2014)",
        "mass_avg": 351.358,
        "mass_monoiso": 351.1543,
        "mass_prot": 352.1621,
        "name": "N6-(cis-hydroxyisopentenyl)adenosine",
        "product_ions": "220",
        "reference_moiety": [
            "A"
        ],
        "short_name": "io6A",
        "smile": "CC(CO)=CCNc1ncnc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
    },
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        "abbrev": "\u2118",
        "formula": "C11H14N2O7S",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 318.303,
        "mass_monoiso": 318.0522,
        "mass_prot": 319.06,
        "name": "5-carboxymethyl-2-thiouridine",
        "product_ions": "187/169/141",
        "reference_moiety": [
            "U"
        ],
        "short_name": "cm5s2U",
        "smile": "OC(Cc1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=S)[nH]c1=O)=O"
    },
    "12": {
        "abbrev": "T",
        "formula": "C10H14N2O6",
        "lc_elution_comment": "co-eluting with G (Kellner 2014, Kellner 2014)",
        "lc_elution_time": "1 (Kellner 2014, Kellner 2014)",
        "mass_avg": 258.228,
        "mass_monoiso": 258.0852,
        "mass_prot": 259.093,
        "name": "5-methyluridine",
        "product_ions": "127",
        "reference_moiety": [
            "U"
        ],
        "short_name": "m5U",
        "smile": "Cc1c(=O)[nH]c(=O)[n]([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)c1"
    },
    "13": {
        "abbrev": "R",
        "formula": "C12H17N5O5",
        "lc_elution_comment": "between A and m6A (Kellner 2014)",
        "lc_elution_time": "1,62 (Kellner 2014)",
        "mass_avg": 311.294,
        "mass_monoiso": 311.123,
        "mass_prot": 312.1308,
        "name": "N2,N2-dimethylguanosine",
        "product_ions": "180",
        "reference_moiety": [
            "G"
        ],
        "short_name": "m2,2G",
        "smile": "CN(C)c1[nH]c(=O)c2nc[n]([C@@H]3O[C@H](CO)[C@@H](O)[C@H]3O)c2n1"
    },
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        "abbrev": "D",
        "formula": "C9H14N2O6",
        "lc_elution_comment": "before C (Kellner 2014, Kellner 2014)",
        "lc_elution_time": "0,32 (Kellner 2014); 0,35 (Kellner 2014)",
        "mass_avg": 246.217,
        "mass_monoiso": 246.0852,
        "mass_prot": 247.093,
        "name": "dihydrouridine",
        "product_ions": "115/97",
        "reference_moiety": [
            "U"
        ],
        "short_name": "D",
        "smile": "OC[C@H]1O[C@@H](N2CCC(=O)NC2=O)[C@H](O)[C@@H]1O"
    },
    "15": {
        "abbrev": "\u03bc",
        "formula": "C11H17N3O5",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 271.27,
        "mass_monoiso": 271.1168,
        "mass_prot": 272.1246,
        "name": "N4,N4-dimethylcytidine",
        "product_ions": "140",
        "reference_moiety": [
            "C"
        ],
        "short_name": "m4,4C",
        "smile": "CN(c1nc(=O)[n]([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)cc1)C"
    },
    "16": {
        "abbrev": "E",
        "formula": "C15H20N6O8",
        "lc_elution_comment": "between A and m6A (Kellner 2014)",
        "lc_elution_time": "1,93 (Kellner 2014)",
        "mass_avg": 412.355,
        "mass_monoiso": 412.1343,
        "mass_prot": 413.1416,
        "name": "N6-methyl-N6-threonylcarbamoyladenosine",
        "product_ions": "295",
        "reference_moiety": [
            "A"
        ],
        "short_name": "m6t6A",
        "smile": "C[C@H]([C@@H](C(=O)O)NC(Nc1c2c([n]([C@H]3[C@H](O)[C@H](O)[C@@H](CO)O3)cn2)ncn1)=O)O"
    },
    "17": {
        "abbrev": "\u03c1",
        "formula": "C10H16N2O6",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 260.244,
        "mass_monoiso": 260.1008,
        "mass_prot": 261.1086,
        "name": "5-methyldihydrouridine",
        "product_ions": "129",
        "reference_moiety": [
            "U"
        ],
        "short_name": "m5D",
        "smile": "CC1C(=O)NC(=O)N([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)C1"
    },
    "18": {
        "abbrev": "?",
        "formula": "C10H15N3O5",
        "lc_elution_comment": "between U and G (Kellner 2014, Kellner 2014)",
        "lc_elution_time": "0,82 (Kellner 2014); 0,84 (Kellner 2014)",
        "mass_avg": 257.243,
        "mass_monoiso": 257.1012,
        "mass_prot": 258.109,
        "name": "5-methylcytidine",
        "product_ions": "126",
        "reference_moiety": [
            "C"
        ],
        "short_name": "m5C",
        "smile": "Cc1c(N)nc(=O)[n]([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)c1"
    },
    "19": {
        "abbrev": "\u221a",
        "formula": "C16H22N6O8",
        "lc_elution_comment": "between A and m6A (Kellner 2014)",
        "lc_elution_time": "1,93 (Kellner 2014)",
        "mass_avg": 426.381,
        "mass_monoiso": 426.1499,
        "mass_prot": 427.1577,
        "name": "N6-hydroxynorvalylcarbamoyladenosine",
        "product_ions": "295",
        "reference_moiety": [
            "A"
        ],
        "short_name": "hn6A",
        "smile": "CCC(O)C(NC(Nc1ncnc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O)=O)C(O)=O"
    },
    "20": {
        "abbrev": "^",
        "formula": "C15H20N5O11P",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 477.32,
        "mass_monoiso": 477.0897,
        "mass_prot": null,
        "name": "2'-O-ribosyladenosine (phosphate)",
        "product_ions": null,
        "reference_moiety": [
            "A"
        ],
        "short_name": "Ar(p)",
        "smile": "[O-]P(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)O[C@@H]1[C@@H]([C@H](O[C@H]1[n]1c2[n]c[n]c(c2[n]c1)N)CO)O)(=O)[O-]"
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    "21": {
        "abbrev": "\u00ca",
        "formula": "C12H19N3O9S",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 381.359,
        "mass_monoiso": 381.0842,
        "mass_prot": 382.092,
        "name": "5-taurinomethyluridine",
        "product_ions": "250",
        "reference_moiety": [
            "U"
        ],
        "short_name": "tm5U",
        "smile": "OC[C@H]1O[C@@H]([n]2cc(CNCCS(O)(=O)=O)c(=O)[nH]c2=O)[C@H](O)[C@@H]1O"
    },
    "22": {
        "abbrev": "K",
        "formula": "C11H15N5O5",
        "lc_elution_comment": "between G and A (Kellner 2014, Kellner 2014)",
        "lc_elution_time": "1,23 (Kellner 2014);  1,28 (Kellner 2014)",
        "mass_avg": 297.267,
        "mass_monoiso": 297.1073,
        "mass_prot": 298.1151,
        "name": "1-methylguanosine",
        "product_ions": "166",
        "reference_moiety": [
            "G"
        ],
        "short_name": "m1G",
        "smile": "CN1C(=O)c2[n]c[n]([C@H]3[C@H](O)[C@H](O)[C@@H](CO)O3)c2N=C1N"
    },
    "23": {
        "abbrev": ")",
        "formula": "C13H19N3O8",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 345.305,
        "mass_monoiso": 345.1172,
        "mass_prot": 346.125,
        "name": "5-carboxymethylaminomethyl-2'-O-methyluridine",
        "product_ions": "271/221/111/129/253/200",
        "reference_moiety": [
            "U"
        ],
        "short_name": "cmnm5Um",
        "smile": "CO[C@H]1[C@H]([n]2cc(CNCC(O)=O)c(=O)[nH]c2=O)O[C@H](CO)[C@H]1O"
    },
    "25": {
        "abbrev": "\u00ce",
        "formula": "",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 0.0,
        "mass_monoiso": 0.0,
        "mass_prot": null,
        "name": "unknown nucleoside 2'-O-methylated",
        "product_ions": "",
        "reference_moiety": [
            "A",
            "U",
            "C",
            "G"
        ],
        "short_name": "Xm",
        "smile": "-"
    },
    "26": {
        "abbrev": "O",
        "formula": "C11H14N4O5",
        "lc_elution_comment": "between G and A (Kellner 2014)",
        "lc_elution_time": "1,24 (Kellner 2014)",
        "mass_avg": 282.253,
        "mass_monoiso": 282.0964,
        "mass_prot": 283.1042,
        "name": "1-methylinosine",
        "product_ions": "151",
        "reference_moiety": [
            "A"
        ],
        "short_name": "m1I",
        "smile": "C[n]1c(=O)c2c([n]([C@H]3[C@H](O)[C@H](O)[C@@H](CO)O3)cn2)nc1"
    },
    "27": {
        "abbrev": "1",
        "formula": "C12H16N2O8",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 316.264,
        "mass_monoiso": 316.0907,
        "mass_prot": 317.0985,
        "name": "5-methoxycarbonylmethyluridine",
        "product_ions": "185/153/125",
        "reference_moiety": [
            "U"
        ],
        "short_name": "mcm5U",
        "smile": "COC(Cc1c(=O)[nH]c(=O)[n]([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)c1)=O"
    },
    "28": {
        "abbrev": "#",
        "formula": "C11H15N5O5",
        "lc_elution_comment": "between G and A (Kellner 2014, Kellner 2014)",
        "lc_elution_time": "1,23 (Kellner 2014); 1,28 (Kellner 2014)",
        "mass_avg": 297.267,
        "mass_monoiso": 297.1073,
        "mass_prot": 298.1144,
        "name": "2'-O-methylguanosine",
        "product_ions": "152",
        "reference_moiety": [
            "G"
        ],
        "short_name": "Gm",
        "smile": "CO[C@H]1[C@H]([n]2cnc3c2nc(N)[nH]c3=O)O[C@H](CO)[C@H]1O"
    },
    "29": {
        "abbrev": "~",
        "formula": "C12H17N3O7",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 315.279,
        "mass_monoiso": 315.1066,
        "mass_prot": 316.1144,
        "name": "5-carbamoylmethyl-2'-O-methyluridine",
        "product_ions": "170/153/125",
        "reference_moiety": [
            "U"
        ],
        "short_name": "ncm5Um",
        "smile": "CO[C@H]1[C@H]([n]2cc(CC(N)=O)c(=O)[nH]c2=O)O[C@H](CO)[C@H]1O"
    },
    "30": {
        "abbrev": "Y",
        "formula": "C21H28N6O9",
        "lc_elution_comment": "after m6A (Kellner 2014)",
        "lc_elution_time": "2,93 (Kellner 2014)",
        "mass_avg": 508.482,
        "mass_monoiso": 508.1918,
        "mass_prot": 509.1996,
        "name": "wybutosine",
        "product_ions": "377",
        "reference_moiety": [
            "G"
        ],
        "short_name": "yW",
        "smile": "COC(NC(C(OC)=O)CCc1[n]2c([n](c3c(c2=O)nc[n]3[C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)C)nc1C)=O"
    },
    "31": {
        "abbrev": ">",
        "formula": "C10H13N3O6",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 271.227,
        "mass_monoiso": 271.0804,
        "mass_prot": 272.0882,
        "name": "5-formylcytidine",
        "product_ions": "140",
        "reference_moiety": [
            "C"
        ],
        "short_name": "f5C",
        "smile": "Nc1nc(=O)[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)cc1C=O"
    },
    "32": {
        "abbrev": "\u0153",
        "formula": "C12H17N5O4",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 295.294,
        "mass_monoiso": 295.1281,
        "mass_prot": 296.1359,
        "name": "1,2'-O-dimethyladenosine",
        "product_ions": "150",
        "reference_moiety": [
            "A"
        ],
        "short_name": "m1Am",
        "smile": "CO[C@H]1[C@H]([n]2c3nc[n](c(=N)c3nc2)C)O[C@H](CO)[C@H]1O"
    },
    "33": {
        "abbrev": "\u03be",
        "formula": "C12H16N4O5",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 296.279,
        "mass_monoiso": 296.1121,
        "mass_prot": 297.1199,
        "name": "1,2'-O-dimethylinosine",
        "product_ions": "151",
        "reference_moiety": [
            "A"
        ],
        "short_name": "m1Im",
        "smile": "CO[C@H]1[C@H]([n]2c3nc[n](c(=O)c3nc2)C)O[C@H](CO)[C@H]1O"
    },
    "34": {
        "abbrev": "\u2111",
        "formula": "C15H20N5O12P",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 493.319,
        "mass_monoiso": 493.0846,
        "mass_prot": null,
        "name": "2'-O-ribosylguanosine (phosphate)",
        "product_ions": null,
        "reference_moiety": [
            "G"
        ],
        "short_name": "Gr(p)",
        "smile": "Nc1[nH]c(=O)c2c([n]([C@H]3[C@H](O[C@H]4[C@H](O)[C@H](O)[C@@H](COP(=O)([O-])[O-])O4)[C@H](O)[C@@H](CO)O3)cn2)n1"
    },
    "35": {
        "abbrev": "\u222b",
        "formula": "C10H15N3O5S",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 289.308,
        "mass_monoiso": 289.0732,
        "mass_prot": 290.081,
        "name": "5-aminomethyl-2-thiouridine",
        "product_ions": "158",
        "reference_moiety": [
            "U"
        ],
        "short_name": "nm5s2U",
        "smile": "NCc1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=S)[nH]c1=O"
    },
    "36": {
        "abbrev": "L",
        "formula": "C11H15N5O5",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 297.267,
        "mass_monoiso": 297.1073,
        "mass_prot": 298.1151,
        "name": "N2-methylguanosine",
        "product_ions": "166",
        "reference_moiety": [
            "G"
        ],
        "short_name": "m2G",
        "smile": "CNc1[nH]c(=O)c2nc[n]([C@@H]3O[C@H](CO)[C@@H](O)[C@H]3O)c2n1"
    },
    "37": {
        "abbrev": "/",
        "formula": "C11H15N5O4",
        "lc_elution_comment": "between A and m6A (Kellner 2014, Kellner 2014)",
        "lc_elution_time": "1,65 (Kellner 2014); 1,91 (Kellner 2014)",
        "mass_avg": 281.268,
        "mass_monoiso": 281.1124,
        "mass_prot": 282.1202,
        "name": "2-methyladenosine",
        "product_ions": "150",
        "reference_moiety": [
            "A"
        ],
        "short_name": "m2A",
        "smile": "Cc1nc2c(nc[n]2[C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)c(N)n1"
    },
    "38": {
        "abbrev": "G",
        "formula": "C10H13N5O5",
        "lc_elution_comment": "",
        "lc_elution_time": "1",
        "mass_avg": 283.241,
        "mass_monoiso": 283.0917,
        "mass_prot": 284.0995,
        "name": "guanosine",
        "product_ions": "152",
        "reference_moiety": [
            "G"
        ],
        "short_name": "G",
        "smile": "Nc1[nH]c(=O)c2nc[n]([C@@H]3O[C@H](CO)[C@@H](O)[C@H]3O)c2n1"
    },
    "39": {
        "abbrev": "\u03bb",
        "formula": "C11H17N3O5",
        "lc_elution_comment": "between G and A (Kellner 2014)",
        "lc_elution_time": "1,20 (Kellner 2014)",
        "mass_avg": 271.27,
        "mass_monoiso": 271.1168,
        "mass_prot": 272.1246,
        "name": "N4,2'-O-dimethylcytidine",
        "product_ions": "126",
        "reference_moiety": [
            "C"
        ],
        "short_name": "m4Cm",
        "smile": "CO[C@H]1[C@H]([n]2ccc(NC)nc2=O)O[C@H](CO)[C@H]1O"
    },
    "40": {
        "abbrev": "|",
        "formula": "C13H19N5O5",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 325.32,
        "mass_monoiso": 325.1386,
        "mass_prot": 326.1464,
        "name": "N2,N2,2'-O-trimethylguanosine",
        "product_ions": "180",
        "reference_moiety": [
            "G"
        ],
        "short_name": "m2,2Gm",
        "smile": "CN(C)c1[nH]c(=O)c2nc[n]([C@@H]3O[C@H](CO)[C@@H](O)[C@H]3OC)c2n1"
    },
    "41": {
        "abbrev": "\u03b6",
        "formula": "C12H17N5O4",
        "lc_elution_comment": "after m6A (Kellner 2014, Kellner 2014)",
        "lc_elution_time": "1,86 (Kellner 2014); 2,57 (Kellner 2014)",
        "mass_avg": 295.294,
        "mass_monoiso": 295.1281,
        "mass_prot": 296.1359,
        "name": "N6,N6-dimethyladenosine",
        "product_ions": "164",
        "reference_moiety": [
            "A"
        ],
        "short_name": "m6,6A",
        "smile": "CN(C)c1ncnc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
    },
    "42": {
        "abbrev": "\u2284",
        "formula": "C22H29N6O10",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 537.5,
        "mass_monoiso": 537.2023,
        "mass_prot": 538.2101,
        "name": "glutamyl-queuosine",
        "product_ions": "407",
        "reference_moiety": [
            "G"
        ],
        "short_name": "gluQ",
        "smile": "NC(C(O[C@@H]1[C@@H](NCc2c3c(nc(nc3=O)N)[n]([C@H]3[C@H](O)[C@H](O)[C@@H](CO)O3)c2)C=C[C@@H]1O)=O)CCC(=O)O"
    },
    "43": {
        "abbrev": "&",
        "formula": "C11H15N3O7",
        "lc_elution_comment": "between C and U (Kellner 2014)",
        "lc_elution_time": "0,50 (Kellner 2014)",
        "mass_avg": 301.253,
        "mass_monoiso": 301.091,
        "mass_prot": 302.0988,
        "name": "5-carbamoylmethyluridine",
        "product_ions": "170/153/125",
        "reference_moiety": [
            "U"
        ],
        "short_name": "ncm5U",
        "smile": "NC(Cc1c(=O)[nH]c(=O)[n]([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)c1)=O"
    },
    "44": {
        "abbrev": "\u25ca",
        "formula": "C11H14N2O8",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 302.237,
        "mass_monoiso": 302.075,
        "mass_prot": 303.0828,
        "name": "5-carboxymethyluridine",
        "product_ions": "171",
        "reference_moiety": [
            "U"
        ],
        "short_name": "cm5U",
        "smile": "OC[C@@H]1[C@@H](O)[C@@H](O)[C@H]([n]2c(=O)[nH]c(=O)c(CC(=O)O)c2)O1"
    },
    "45": {
        "abbrev": "$",
        "formula": "C12H17N3O7S",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 347.344,
        "mass_monoiso": 347.0787,
        "mass_prot": 348.0865,
        "name": "5-carboxymethylaminomethyl-2-thiouridine",
        "product_ions": "255/273/141/216/237/225",
        "reference_moiety": [
            "U"
        ],
        "short_name": "cmnm5s2U",
        "smile": "OC(CNCc1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=S)[nH]c1=O)=O"
    },
    "46": {
        "abbrev": "C",
        "formula": "C9H13N3O5",
        "lc_elution_comment": "",
        "lc_elution_time": "0.42",
        "mass_avg": 243.217,
        "mass_monoiso": 243.0855,
        "mass_prot": 244.0933,
        "name": "cytidine",
        "product_ions": "112",
        "reference_moiety": [
            "C"
        ],
        "short_name": "C",
        "smile": "Nc1nc(=O)[n]([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)cc1"
    },
    "47": {
        "abbrev": "V",
        "formula": "C11H14N2O9",
        "lc_elution_comment": "between C and U (Kellner 2014)",
        "lc_elution_time": "0,54 (Kellner 2014)",
        "mass_avg": 318.237,
        "mass_monoiso": 318.0699,
        "mass_prot": 319.0777,
        "name": "uridine 5-oxyacetic acid",
        "product_ions": "187/169/141",
        "reference_moiety": [
            "U"
        ],
        "short_name": "cmo5U",
        "smile": "OC[C@@H]1[C@@H](O)[C@@H](O)[C@H]([n]2c(=O)[nH]c(=O)c(OCC(=O)O)c2)O1"
    },
    "48": {
        "abbrev": "\u03ba",
        "formula": "C10H14N2O6",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 258.228,
        "mass_monoiso": 258.0852,
        "mass_prot": 259.093,
        "name": "3-methylpseudouridine",
        "product_ions": "169/179/227/209",
        "reference_moiety": [
            "U"
        ],
        "short_name": "m3Y",
        "smile": "C[n]1c(=O)c([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)c[nH]c1=O"
    },
    "49": {
        "abbrev": "\u03b4",
        "formula": "C10H14N2O6",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 258.228,
        "mass_monoiso": 258.0852,
        "mass_prot": 259.093,
        "name": "3-methyluridine",
        "product_ions": "127",
        "reference_moiety": [
            "U"
        ],
        "short_name": "m3U",
        "smile": "C[n]1c(=O)[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)ccc1=O"
    },
    "50": {
        "abbrev": "J",
        "formula": "C10H14N2O6",
        "lc_elution_comment": "between G and A (Kellner 2014, Kellner 2014)",
        "lc_elution_time": "1,10 (Kellner 2014); 1,09 (Kellner 2014)",
        "mass_avg": 258.228,
        "mass_monoiso": 258.0852,
        "mass_prot": 259.0926,
        "name": "2'-O-methyluridine",
        "product_ions": "113",
        "reference_moiety": [
            "U"
        ],
        "short_name": "Um",
        "smile": "CO[C@H]1[C@H]([n]2ccc(=O)[nH]c2=O)O[C@H](CO)[C@H]1O"
    },
    "51": {
        "abbrev": "*",
        "formula": "C16H23N5O4S",
        "lc_elution_comment": "after m6A (Kellner 2014)",
        "lc_elution_time": "3,54 (Kellner 2014)",
        "mass_avg": 381.45,
        "mass_monoiso": 381.1471,
        "mass_prot": 382.1549,
        "name": "2-methylthio-N6-isopentenyladenosine",
        "product_ions": "250",
        "reference_moiety": [
            "A"
        ],
        "short_name": "ms2i6A",
        "smile": "CC(C)=CCNc1nc(SC)nc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
    },
    "52": {
        "abbrev": "'",
        "formula": "C10H16N3O5",
        "lc_elution_comment": "between C and U (Kellner 2014, Kellner 2014)",
        "lc_elution_time": "0,55 (Kellner 2014); 0,54 (Kellner 2014)",
        "mass_avg": 258.251,
        "mass_monoiso": 257.1012,
        "mass_prot": 258.109,
        "name": "3-methylcytidine",
        "product_ions": "126",
        "reference_moiety": [
            "C"
        ],
        "short_name": "m3C",
        "smile": "C[n+]1c(N)cc[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c1=O"
    },
    "54": {
        "abbrev": "\u22a5",
        "formula": "C12H17N3O7Se",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 394.239,
        "mass_monoiso": 393.0239,
        "mass_prot": 394.0317,
        "name": "5-carboxymethylaminomethyl-2-selenouridine",
        "product_ions": "262",
        "reference_moiety": [
            "U"
        ],
        "short_name": "cmnm5se2U",
        "smile": "OC(CNCc1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=[Se])[nH]c1=O)=O"
    },
    "55": {
        "abbrev": "[",
        "formula": "C16H22N6O8S",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 458.446,
        "mass_monoiso": 458.122,
        "mass_prot": 459.1298,
        "name": "2-methylthio-N6-threonylcarbamoyladenosine",
        "product_ions": "327",
        "reference_moiety": [
            "A"
        ],
        "short_name": "ms2t6A",
        "smile": "CC(O)C(NC(Nc1nc(SC)nc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O)=O)C(O)=O"
    },
    "56": {
        "abbrev": "+",
        "formula": "C15H21N5O4",
        "lc_elution_comment": "after m6A (Kellner 2014)",
        "lc_elution_time": "3,24 (Kellner 2014)",
        "mass_avg": 335.358,
        "mass_monoiso": 335.1594,
        "mass_prot": 336.1672,
        "name": "N6-isopentenyladenosine",
        "product_ions": "204/136/148",
        "reference_moiety": [
            "A"
        ],
        "short_name": "i6A",
        "smile": "CC(C)=CCNc1ncnc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
    },
    "57": {
        "abbrev": "\u03c3",
        "formula": "C11H16N2O6",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 272.255,
        "mass_monoiso": 272.1008,
        "mass_prot": 273.1086,
        "name": "3,2'-O-dimethyluridine",
        "product_ions": "127",
        "reference_moiety": [
            "U"
        ],
        "short_name": "m3Um",
        "smile": "C[n]1c(=O)cc[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2OC)c1=O"
    },
    "58": {
        "abbrev": "\u03c5",
        "formula": "C12H16N2O9",
        "lc_elution_comment": "between A and m6A (Kellner 2014)",
        "lc_elution_time": "1,47 (Kellner 2014)",
        "mass_avg": 332.263,
        "mass_monoiso": 332.0856,
        "mass_prot": 333.0934,
        "name": "uridine 5-oxyacetic acid methyl ester",
        "product_ions": "183/201/297/315/129",
        "reference_moiety": [
            "U"
        ],
        "short_name": "mcmo5U",
        "smile": "COC(COc1c[n](C2O[C@H](CO)[C@@H](O)[C@H]2O)c(=O)[nH]c1=O)=O"
    },
    "59": {
        "abbrev": "\u2211",
        "formula": "C15H19N5O5",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 349.342,
        "mass_monoiso": 349.1386,
        "mass_prot": 350.1464,
        "name": "methylwyosine",
        "product_ions": "218",
        "reference_moiety": [
            "G"
        ],
        "short_name": "mimG",
        "smile": "Cc1c(C)[n]2c([n](c3c(c2=O)nc[n]3[C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)C)n1"
    },
    "60": {
        "abbrev": "U",
        "formula": "C9H12N2O6",
        "lc_elution_comment": "",
        "lc_elution_time": "0.58",
        "mass_avg": 244.201,
        "mass_monoiso": 244.0695,
        "mass_prot": 245.0773,
        "name": "uridine",
        "product_ions": "113",
        "reference_moiety": [
            "U"
        ],
        "short_name": "U",
        "smile": "OC[C@H]1O[C@@H]([n]2ccc(=O)[nH]c2=O)[C@H](O)[C@@H]1O"
    },
    "61": {
        "abbrev": "\u2207",
        "formula": "C7H9N5O",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 179.179,
        "mass_monoiso": 179.0807,
        "mass_prot": null,
        "name": "7-aminomethyl-7-carbaguanine",
        "product_ions": "",
        "reference_moiety": [
            "G"
        ],
        "short_name": "preQ1base",
        "smile": "Nc1[nH]c(=O)c2c([nH]cc2CN)n1"
    },
    "62": {
        "abbrev": "\u03c0",
        "formula": "C10H15N3O5Se",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 336.203,
        "mass_monoiso": 337.0176,
        "mass_prot": 336.0263,
        "name": "5-aminomethyl-2-selenouridine",
        "product_ions": "204",
        "reference_moiety": [
            "U"
        ],
        "short_name": "nm5se2U",
        "smile": "NCc1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=[Se])[nH]c1=O"
    },
    "63": {
        "abbrev": "\u03b5",
        "formula": "C12H17N5O5",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 311.294,
        "mass_monoiso": 311.123,
        "mass_prot": 312.1308,
        "name": "1,2'-O-dimethylguanosine",
        "product_ions": "166",
        "reference_moiety": [
            "G"
        ],
        "short_name": "m1Gm",
        "smile": "CO[C@H]1[C@H]([n]2c3nc([n](c(=O)c3nc2)C)N)O[C@H](CO)[C@H]1O"
    },
    "64": {
        "abbrev": "\u221d",
        "formula": "C9H12N2O7",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 260.201,
        "mass_monoiso": 260.0645,
        "mass_prot": 261.0717,
        "name": "5-hydroxyuridine",
        "product_ions": "129",
        "reference_moiety": [
            "U"
        ],
        "short_name": "ho5U",
        "smile": "OC[C@@H]1[C@@H](O)[C@@H](O)[C@H]([n]2c(=O)[nH]c(=O)c(O)c2)O1"
    },
    "65": {
        "abbrev": "Q",
        "formula": "C17H23N5O7",
        "lc_elution_comment": "after m6A (Kellner 2014)",
        "lc_elution_time": "3,40 (Kellner 2014)",
        "mass_avg": 409.394,
        "mass_monoiso": 409.1597,
        "mass_prot": 410.1675,
        "name": "queuosine",
        "product_ions": "295/163",
        "reference_moiety": [
            "G"
        ],
        "short_name": "Q",
        "smile": "Nc1[nH]c(=O)c2c([n]([C@H]3[C@H](O)[C@H](O)[C@@H](CO)O3)cc2CN[C@@H]2[C@@H](O)[C@@H](O)C=C2)n1"
    },
    "66": {
        "abbrev": ";",
        "formula": "",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 0.0,
        "mass_monoiso": 0.0,
        "mass_prot": null,
        "name": "unknown modified guanosine",
        "product_ions": null,
        "reference_moiety": [
            "G"
        ],
        "short_name": "xG",
        "smile": "-"
    },
    "68": {
        "abbrev": "3",
        "formula": "C12H16N2O7S",
        "lc_elution_comment": "between A and m6A (Kellner 2014)",
        "lc_elution_time": "1,78 (Kellner 2014)",
        "mass_avg": 332.33,
        "mass_monoiso": 332.0678,
        "mass_prot": 333.0756,
        "name": "5-methoxycarbonylmethyl-2-thiouridine",
        "product_ions": "201/169/141",
        "reference_moiety": [
            "U"
        ],
        "short_name": "mcm5s2U",
        "smile": "COC(Cc1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=S)[nH]c1=O)=O"
    },
    "69": {
        "abbrev": "\u03b2",
        "formula": "C12H19N3O5",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 285.296,
        "mass_monoiso": 285.1325,
        "mass_prot": 286.1403,
        "name": "N4,N4,2'-O-trimethylcytidine",
        "product_ions": "140",
        "reference_moiety": [
            "C"
        ],
        "short_name": "m4,4Cm",
        "smile": "CO[C@H]1[C@H]([n]2c(=O)nc(N(C)C)cc2)O[C@H](CO)[C@H]1O"
    },
    "70": {
        "abbrev": "<",
        "formula": "",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 0.0,
        "mass_monoiso": 0.0,
        "mass_prot": null,
        "name": "unknown modified cytidine",
        "product_ions": null,
        "reference_moiety": [
            "C"
        ],
        "short_name": "xC",
        "smile": "-"
    },
    "71": {
        "abbrev": "\u00a5",
        "formula": "C17H22N6O7",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 422.393,
        "mass_monoiso": 422.155,
        "mass_prot": 423.1628,
        "name": "7-aminocarboxypropyl-demethylwyosine",
        "product_ions": "291",
        "reference_moiety": [
            "G"
        ],
        "short_name": "yW-86",
        "smile": "Cc1nc2[nH]c3c(c(=O)[n]2c1CCC(N)C(O)=O)nc[n]3[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
    },
    "72": {
        "abbrev": "H",
        "formula": "",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 0.0,
        "mass_monoiso": 0.0,
        "mass_prot": null,
        "name": "unknown modified adenosine",
        "product_ions": "",
        "reference_moiety": [
            "A"
        ],
        "short_name": "xA",
        "smile": ""
    },
    "73": {
        "abbrev": "\u2265",
        "formula": "C11H14N2O9",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 318.237,
        "mass_monoiso": 318.0699,
        "mass_prot": 319.0777,
        "name": "5-carboxyhydroxymethyluridine",
        "product_ions": "187/169/141",
        "reference_moiety": [
            "U"
        ],
        "short_name": "chm5U",
        "smile": "OC[C@@H]1[C@@H](O)[C@@H](O)[C@H]([n]2c(=O)[nH]c(=O)c(C(C(=O)O)O)c2)O1"
    },
    "74": {
        "abbrev": "5",
        "formula": "C10H14N2O7",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 274.227,
        "mass_monoiso": 274.0801,
        "mass_prot": 275.0879,
        "name": "5-methoxyuridine",
        "product_ions": "143",
        "reference_moiety": [
            "U"
        ],
        "short_name": "mo5U",
        "smile": "COc1c(=O)[nH]c(=O)[n]([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)c1"
    },
    "75": {
        "abbrev": "X",
        "formula": "C13H19N3O8",
        "lc_elution_comment": "between C and U (Kellner 2014)",
        "lc_elution_time": "0,46 (Kellner 2014)",
        "mass_avg": 345.305,
        "mass_monoiso": 345.1172,
        "mass_prot": 346.125,
        "name": "3-(3-amino-3-carboxypropyl)uridine",
        "product_ions": "214/197/168",
        "reference_moiety": [
            "U"
        ],
        "short_name": "acp3U",
        "smile": "NC(CC[n]1c(=O)[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)ccc1=O)C(O)=O"
    },
    "76": {
        "abbrev": "N",
        "formula": "",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 0.0,
        "mass_monoiso": 0.0,
        "mass_prot": null,
        "name": "unknown modified uridine",
        "product_ions": null,
        "reference_moiety": [
            "U"
        ],
        "short_name": "xU",
        "smile": "-"
    },
    "77": {
        "abbrev": "\u03a9",
        "formula": "C18H24N6O7",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 436.419,
        "mass_monoiso": 436.1706,
        "mass_prot": 437.1784,
        "name": "7-aminocarboxypropylwyosine",
        "product_ions": "305",
        "reference_moiety": [
            "G"
        ],
        "short_name": "yW-72",
        "smile": "C[n]1c2c(nc[n]2[C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=O)[n]2c1nc(C)c2CCC(N)C(O)=O"
    },
    "78": {
        "abbrev": "\u2245",
        "formula": "C11H17N3O5Se",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 350.23,
        "mass_monoiso": 349.0341,
        "mass_prot": 350.0419,
        "name": "5-methylaminomethyl-2-selenouridine",
        "product_ions": "218",
        "reference_moiety": [
            "U"
        ],
        "short_name": "mnm5se2U",
        "smile": "CNCc1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=[Se])[nH]c1=O"
    },
    "79": {
        "abbrev": "\u2248",
        "formula": "C17H24N6O8S",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 472.473,
        "mass_monoiso": 472.1376,
        "mass_prot": 473.1454,
        "name": "2-methylthio-N6-hydroxynorvalylcarbamoyladenosine",
        "product_ions": "341",
        "reference_moiety": [
            "A"
        ],
        "short_name": "ms2hn6A",
        "smile": "CCC(O)C(NC(Nc1nc(SC)nc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O)=O)C(O)=O"
    },
    "80": {
        "abbrev": "\u2229",
        "formula": "C13H18N2O8",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 330.291,
        "mass_monoiso": 330.1063,
        "mass_prot": 331.1141,
        "name": "5-methoxycarbonylmethyl-2'-O-methyluridine",
        "product_ions": "185",
        "reference_moiety": [
            "U"
        ],
        "short_name": "mcm5Um",
        "smile": "CO[C@H]1[C@H]([n]2c(=O)[nH]c(=O)c(CC(OC)=O)c2)O[C@H](CO)[C@H]1O"
    },
    "81": {
        "abbrev": "M",
        "formula": "C11H15N3O6",
        "lc_elution_comment": "between G and A (Kellner 2014)",
        "lc_elution_time": "1,35 (Kellner 2014)",
        "mass_avg": 285.253,
        "mass_monoiso": 285.0961,
        "mass_prot": 286.1039,
        "name": "N4-acetylcytidine",
        "product_ions": "154/112",
        "reference_moiety": [
            "C"
        ],
        "short_name": "ac4C",
        "smile": "CC(Nc1nc(=O)[n]([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)cc1)=O"
    },
    "82": {
        "abbrev": "\u03c7",
        "formula": "C12H17N5O4",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 295.294,
        "mass_monoiso": 295.1281,
        "mass_prot": 296.1359,
        "name": "N6,2'-O-dimethyladenosine",
        "product_ions": "150",
        "reference_moiety": [
            "A"
        ],
        "short_name": "m6Am",
        "smile": "CO[C@H]1[C@H]([n]2cnc3c2ncnc3NC)O[C@H](CO)[C@H]1O"
    },
    "83": {
        "abbrev": "\"",
        "formula": "C11H15N5O4",
        "lc_elution_comment": "between U and G (Kellner 2014, Kellner 2014)",
        "lc_elution_time": "0,64 (Kellner 2014); 0,72 (Kellner 2014)",
        "mass_avg": 281.268,
        "mass_monoiso": 281.1124,
        "mass_prot": 282.1202,
        "name": "1-methyladenosine",
        "product_ions": "150",
        "reference_moiety": [
            "A"
        ],
        "short_name": "m1A",
        "smile": "C[n]1c(=N)c2c([n]([C@H]3[C@H](O)[C@H](O)[C@@H](CO)O3)cn2)nc1"
    },
    "84": {
        "abbrev": "B",
        "formula": "C10H15N3O5",
        "lc_elution_comment": "between U and G (Kellner 2014, Kellner 2014)",
        "lc_elution_time": "0,90 (Kellner 2014); 0,92 (Kellner 2014)",
        "mass_avg": 257.243,
        "mass_monoiso": 257.1012,
        "mass_prot": 258.1082,
        "name": "2'-O-methylcytidine",
        "product_ions": "112",
        "reference_moiety": [
            "C"
        ],
        "short_name": "Cm",
        "smile": "CO[C@H]1[C@H]([n]2ccc(N)nc2=O)O[C@H](CO)[C@H]1O"
    },
    "85": {
        "abbrev": ",",
        "formula": "C12H16N2O9",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 332.263,
        "mass_monoiso": 332.0856,
        "mass_prot": 333.0934,
        "name": "5-(carboxyhydroxymethyl)uridine methyl ester",
        "product_ions": "129/183/316/201/297",
        "reference_moiety": [
            "U"
        ],
        "short_name": "mchm5U",
        "smile": "COC(C(c1c(=O)[nH]c(=O)[n]([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)c1)O)=O"
    },
    "86": {
        "abbrev": "9",
        "formula": "C23H33N5O12",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 571.534,
        "mass_monoiso": 571.2126,
        "mass_prot": 572.2204,
        "name": "galactosyl-queuosine",
        "product_ions": "440",
        "reference_moiety": [
            "G"
        ],
        "short_name": "galQ",
        "smile": "Nc1[nH]c(=O)c2c([n]([C@H]3[C@H](O)[C@H](O)[C@@H](CO)O3)cc2CN[C@@H]2[C@@H](O[C@H]3C(O)[C@H](O)[C@@H](O)C(CO)O3)[C@@H](O)C=C2)n1"
    },
    "87": {
        "abbrev": "!",
        "formula": "C12H17N3O8",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 331.279,
        "mass_monoiso": 331.1016,
        "mass_prot": 332.1094,
        "name": "5-carboxymethylaminomethyluridine",
        "product_ions": "239/257/209/125/200/221",
        "reference_moiety": [
            "U"
        ],
        "short_name": "cmnm5U",
        "smile": "OC[C@@H]1[C@@H](O)[C@@H](O)[C@H]([n]2c(=O)[nH]c(=O)c(CNCC(=O)O)c2)O1"
    },
    "88": {
        "abbrev": "]",
        "formula": "C10H14N2O6",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 258.228,
        "mass_monoiso": 258.0852,
        "mass_prot": 259.093,
        "name": "1-methylpseudouridine",
        "product_ions": "169/179/227/209",
        "reference_moiety": [
            "U"
        ],
        "short_name": "m1Y",
        "smile": "C[n]1c(=O)[nH]c(=O)c([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)c1"
    },
    "89": {
        "abbrev": "\u2287",
        "formula": "C14H17N5O5",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 335.315,
        "mass_monoiso": 335.123,
        "mass_prot": 336.1308,
        "name": "isowyosine",
        "product_ions": "204",
        "reference_moiety": [
            "G"
        ],
        "short_name": "imG2",
        "smile": "Cc1nc2[nH]c3c(c(=O)[n]2c1C)nc[n]3[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
    },
    "90": {
        "abbrev": "8",
        "formula": "C23H32N5O12",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 570.526,
        "mass_monoiso": 570.2126,
        "mass_prot": 571.2204,
        "name": "mannosyl-queuosine",
        "product_ions": "440",
        "reference_moiety": [
            "G"
        ],
        "short_name": "manQ",
        "smile": "Nc1nc(=O)c2c([n]([C@H]3[C@H](O)[C@H](O)[C@@H](CO)O3)cc2CN[C@@H]2[C@@H](O[C@H]3C(O)[C@H](O)[C@H](O)C(CO)O3)[C@@H](O)C=C2)n1"
    },
    "91": {
        "abbrev": "\u2203",
        "formula": "C12H19N3O8S2",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 397.425,
        "mass_monoiso": 397.0614,
        "mass_prot": 398.0692,
        "name": "5-taurinomethyl-2-thiouridine",
        "product_ions": "266",
        "reference_moiety": [
            "U"
        ],
        "short_name": "tm5s2U",
        "smile": "OC[C@H]1O[C@@H]([n]2cc(CNCCS(O)(=O)=O)c(=O)[nH]c2=S)[C@H](O)[C@@H]1O"
    },
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        "abbrev": "%",
        "formula": "C9H13N3O4S",
        "lc_elution_comment": "between U and G (Kellner 2014, Kellner 2014)",
        "lc_elution_time": "0,68 (Kellner 2014); 0,86 (Kellner 2014)",
        "mass_avg": 259.282,
        "mass_monoiso": 259.0627,
        "mass_prot": 260.0705,
        "name": "2-thiocytidine",
        "product_ions": "128",
        "reference_moiety": [
            "C"
        ],
        "short_name": "s2C",
        "smile": "Nc1nc(=S)[n]([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)cc1"
    },
    "93": {
        "abbrev": "\u0161",
        "formula": "C18H24N6O8",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 452.419,
        "mass_monoiso": 452.1655,
        "mass_prot": 453.1733,
        "name": "undermodified hydroxywybutosine",
        "product_ions": "321",
        "reference_moiety": [
            "G"
        ],
        "short_name": "OHyWx",
        "smile": "C[n]1c2c(nc[n]2[C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=O)[n]2c1nc(C)c2CC(O)C(N)C(O)=O"
    },
    "94": {
        "abbrev": "\u03c9",
        "formula": "C9H12N2O5Se",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 307.162,
        "mass_monoiso": 305.9919,
        "mass_prot": 306.9997,
        "name": "2-selenouridine",
        "product_ions": "175",
        "reference_moiety": [
            "U"
        ],
        "short_name": "se2U",
        "smile": "O[C@H]1[C@H]([n]2ccc(=O)[nH]c2=[Se])O[C@H](CO)[C@H]1O"
    },
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        "abbrev": "\u03c8",
        "formula": "C7H5N5O",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 175.148,
        "mass_monoiso": 175.0494,
        "mass_prot": null,
        "name": "7-cyano-7-carbaguanine",
        "product_ions": "",
        "reference_moiety": [
            "G"
        ],
        "short_name": "preQ0base",
        "smile": "Nc1[nH]c(=O)c2c(c[nH]c2n1)C#N"
    },
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        "abbrev": "=",
        "formula": "C11H15N5O4",
        "lc_elution_comment": "after A (Kellner 2014, Kellner 2014)",
        "lc_elution_time": "1,66 (Kellner 2014); 1,97 (Kellner 2014)",
        "mass_avg": 281.268,
        "mass_monoiso": 281.1124,
        "mass_prot": 282.1202,
        "name": "N6-methyladenosine",
        "product_ions": "150",
        "reference_moiety": [
            "A"
        ],
        "short_name": "m6A",
        "smile": "CNc1ncnc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
    },
    "97": {
        "abbrev": "\u2286",
        "formula": "C21H28N6O10",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 524.481,
        "mass_monoiso": 524.1867,
        "mass_prot": 525.1945,
        "name": "hydroxywybutosine",
        "product_ions": "393",
        "reference_moiety": [
            "G"
        ],
        "short_name": "OHyW",
        "smile": "C[n]1c2c(nc[n]2[C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=O)[n]2c1nc(C)c2CC(O)C(NC(OC)=O)C(OC)=O"
    },
    "98": {
        "abbrev": "@",
        "formula": "",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 0.0,
        "mass_monoiso": 0.0,
        "mass_prot": null,
        "name": "unknown modification",
        "product_ions": null,
        "reference_moiety": [
            "A",
            "U",
            "C",
            "G"
        ],
        "short_name": "xX",
        "smile": "-"
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    "99": {
        "abbrev": "(",
        "formula": "C12H16N6O5",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 324.293,
        "mass_monoiso": 324.1182,
        "mass_prot": 325.1255,
        "name": "archaeosine",
        "product_ions": "193",
        "reference_moiety": [
            "G"
        ],
        "short_name": "G+",
        "smile": "Nc1[nH]c(=O)c2c(c[n]([C@@H]3O[C@H](CO)[C@@H](O)[C@H]3O)c2n1)C(N)=N"
    },
    "100": {
        "abbrev": "2",
        "formula": "C9H12N2O5S",
        "lc_elution_comment": "between G and A (Kellner 2014)",
        "lc_elution_time": "1,06 (Kellner 2014)",
        "mass_avg": 260.267,
        "mass_monoiso": 260.0467,
        "mass_prot": 261.0545,
        "name": "2-thiouridine",
        "product_ions": "129",
        "reference_moiety": [
            "U"
        ],
        "short_name": "s2U",
        "smile": "O[C@H]1[C@H]([n]2ccc(=O)[nH]c2=S)O[C@H](CO)[C@H]1O"
    },
    "101": {
        "abbrev": "}",
        "formula": "C15H25N5O6",
        "lc_elution_comment": "between G and A (Kellner 2014)",
        "lc_elution_time": "1,14 (Kellner 2014)",
        "mass_avg": 371.389,
        "mass_monoiso": 371.1805,
        "mass_prot": 372.1883,
        "name": "2-lysidine",
        "product_ions": "240",
        "reference_moiety": [
            "C"
        ],
        "short_name": "k2C",
        "smile": "N[C@H](C(=O)O)CCCCN=c1[n]([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)ccc(N)n1"
    },
    "102": {
        "abbrev": "\u03b3",
        "formula": "C12H17N5O5",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 311.294,
        "mass_monoiso": 311.123,
        "mass_prot": 312.1308,
        "name": "N2,2'-O-dimethylguanosine",
        "product_ions": "166",
        "reference_moiety": [
            "G"
        ],
        "short_name": "m2Gm",
        "smile": "CO[C@H]1[C@H]([n]2cnc3c2nc([nH]c3=O)NC)O[C@H](CO)[C@H]1O"
    },
    "103": {
        "abbrev": "Z",
        "formula": "C10H14N2O6",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 258.228,
        "mass_monoiso": 258.0852,
        "mass_prot": 259.093,
        "name": "2'-O-methylpseudouridine",
        "product_ions": "223",
        "reference_moiety": [
            "U"
        ],
        "short_name": "Ym",
        "smile": "CO[C@H]1[C@H](c2c[nH]c(=O)[nH]c2=O)O[C@H](CO)[C@H]1O"
    },
    "104": {
        "abbrev": "\u00b0",
        "formula": "C11H15N3O6",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 285.253,
        "mass_monoiso": 285.0961,
        "mass_prot": 286.1039,
        "name": "5-formyl-2'-O-methylcytidine",
        "product_ions": "140",
        "reference_moiety": [
            "C"
        ],
        "short_name": "f5Cm",
        "smile": "CO[C@H]1[C@H]([n]2cc(C=O)c(N)nc2=O)O[C@H](CO)[C@H]1O"
    },
    "105": {
        "abbrev": "\u2234",
        "formula": "C12H15N5O3",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 277.279,
        "mass_monoiso": 277.1175,
        "mass_prot": 278.1253,
        "name": "queuine",
        "product_ions": "146",
        "reference_moiety": [
            "G"
        ],
        "short_name": "Qbase",
        "smile": "NC1NC(=O)c2c(c[nH]c2N=1)CN[C@@H]1[C@@H](O)[C@@H](O)C=C1"
    },
    "106": {
        "abbrev": "\u2135",
        "formula": "C12H17N3O6",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 299.28,
        "mass_monoiso": 299.1117,
        "mass_prot": 300.1195,
        "name": "N4-acetyl-2'-O-methylcytidine",
        "product_ions": "154/112",
        "reference_moiety": [
            "C"
        ],
        "short_name": "ac4Cm",
        "smile": "CO[C@H]1[C@H]([n]2c(=O)nc(NC(=O)C)cc2)O[C@H](CO)[C@H]1O"
    },
    "108": {
        "abbrev": "\u2020",
        "formula": "C13H15N5O5",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 321.289,
        "mass_monoiso": 321.1073,
        "mass_prot": 322.1151,
        "name": "4-demethylwyosine",
        "product_ions": "190",
        "reference_moiety": [
            "G"
        ],
        "short_name": "imG-14",
        "smile": "Cc1c[n]2c(c3nc[n]([C@@H]4O[C@H](CO)[C@@H](O)[C@H]4O)c3[nH]c2n1)=O"
    },
    "109": {
        "abbrev": "A",
        "formula": "C10H13N5O4",
        "lc_elution_comment": "",
        "lc_elution_time": "1.43",
        "mass_avg": 267.241,
        "mass_monoiso": 267.0968,
        "mass_prot": 268.1046,
        "name": "adenosine",
        "product_ions": "136",
        "reference_moiety": [
            "A"
        ],
        "short_name": "A",
        "smile": "Nc1ncnc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
    },
    "110": {
        "abbrev": "S",
        "formula": "C11H17N3O5S",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 303.335,
        "mass_monoiso": 303.0889,
        "mass_prot": 304.0967,
        "name": "5-methylaminomethyl-2-thiouridine",
        "product_ions": "172/255/273/141",
        "reference_moiety": [
            "U"
        ],
        "short_name": "mnm5s2U",
        "smile": "CNCc1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=S)[nH]c1=O"
    },
    "111": {
        "abbrev": "\u2220",
        "formula": "C13H19N5O5",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 325.32,
        "mass_monoiso": 325.1386,
        "mass_prot": 326.1464,
        "name": "N2,N2,7-trimethylguanosine",
        "product_ions": "194",
        "reference_moiety": [
            "G"
        ],
        "short_name": "m2,2,7G",
        "smile": "CN(c1nc(=O)c2c([n]([C@H]3[C@H](O)[C@H](O)[C@@H](CO)O3)c[n+]2C)n1)C"
    },
    "112": {
        "abbrev": "\u21d1",
        "formula": "C19H26N6O7",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 450.446,
        "mass_monoiso": 450.1863,
        "mass_prot": 451.1941,
        "name": "7-aminocarboxypropylwyosine methyl ester",
        "product_ions": "319",
        "reference_moiety": [
            "G"
        ],
        "short_name": "yW-58",
        "smile": "C[n]1c2nc(C)c(CCC(N)C(OC)=O)[n]2c(=O)c2nc[n]([C@@H]3O[C@H](CO)[C@@H](O)[C@H]3O)c12"
    },
    "113": {
        "abbrev": "I",
        "formula": "C10H12N4O5",
        "lc_elution_comment": "between U and G (Kellner 2014, Kellner 2014)",
        "lc_elution_time": "0,95 (Kellner 2014, Kellner 2014)",
        "mass_avg": 268.226,
        "mass_monoiso": 268.0808,
        "mass_prot": 269.0886,
        "name": "inosine",
        "product_ions": "137",
        "reference_moiety": [
            "A"
        ],
        "short_name": "I",
        "smile": "OC[C@@H]1[C@@H](O)[C@@H](O)[C@H]([n]2c3nc[nH]c(=O)c3nc2)O1"
    },
    "114": {
        "abbrev": "\u2261",
        "formula": "C13H16N6O7",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 368.302,
        "mass_monoiso": 368.108,
        "mass_prot": 369.1158,
        "name": "N6-glycinylcarbamoyladenosine",
        "product_ions": "237",
        "reference_moiety": [
            "A"
        ],
        "short_name": "g6A",
        "smile": "OC(CNC(Nc1ncnc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O)=O)=O"
    },
    "115": {
        "abbrev": "\u222a",
        "formula": "C10H15N3O6",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 273.243,
        "mass_monoiso": 273.0961,
        "mass_prot": 274.1039,
        "name": "5-aminomethyluridine",
        "product_ions": "142",
        "reference_moiety": [
            "U"
        ],
        "short_name": "nm5U",
        "smile": "NCc1c(=O)[nH]c(=O)[n]([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)c1"
    },
    "116": {
        "abbrev": "7",
        "formula": "C11H15N5O5",
        "lc_elution_comment": "between U and G (Kellner 2014, Kellner 2014)",
        "lc_elution_time": "0,83 (Kellner 2014); 0,89 (Kellner 2014)",
        "mass_avg": 297.267,
        "mass_monoiso": 297.1073,
        "mass_prot": 298.1151,
        "name": "7-methylguanosine",
        "product_ions": "166",
        "reference_moiety": [
            "G"
        ],
        "short_name": "m7G",
        "smile": "[C@@H]1([n]2c[n+](C)c3c2nc(nc3=O)N)O[C@H](CO)[C@@H](O)[C@H]1O"
    },
    "117": {
        "abbrev": "\u220f",
        "formula": "C10H14N2O5S",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 274.294,
        "mass_monoiso": 274.0623,
        "mass_prot": 275.0701,
        "name": "2-thio-2'-O-methyluridine",
        "product_ions": "129",
        "reference_moiety": [
            "U"
        ],
        "short_name": "s2Um",
        "smile": "CO[C@H]1[C@H]([n]2ccc(=O)[nH]c2=S)O[C@H](CO)[C@H]1O"
    },
    "118": {
        "abbrev": "P",
        "formula": "C9H12N2O6",
        "lc_elution_comment": "before C (Kellner 2014)",
        "lc_elution_time": "0,34 (Kellner 2014); 0,37 (Kellner 2014)",
        "mass_avg": 244.201,
        "mass_monoiso": 244.0695,
        "mass_prot": 245.0773,
        "name": "pseudouridine",
        "product_ions": "209/179/155",
        "reference_moiety": [
            "U"
        ],
        "short_name": "Y",
        "smile": "OC[C@H]1O[C@@H](c2c[nH]c(=O)[nH]c2=O)[C@H](O)[C@@H]1O"
    },
    "119": {
        "abbrev": "\u2205",
        "formula": "C10H15N3O6",
        "lc_elution_comment": "between C and U (Kellner 2014)",
        "lc_elution_time": "0,52 (Kellner 2014)",
        "mass_avg": 273.243,
        "mass_monoiso": 273.0961,
        "mass_prot": 274.1039,
        "name": "5-hydroxymethylcytidine",
        "product_ions": "142",
        "reference_moiety": [
            "C"
        ],
        "short_name": "hm5C",
        "smile": "Nc1nc(=O)[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)cc1CO"
    },
    "120": {
        "abbrev": "\u03c6",
        "formula": "C12H13N5O5",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 307.262,
        "mass_monoiso": 307.0917,
        "mass_prot": 308.0995,
        "name": "7-cyano-7-deazaguanosine",
        "product_ions": "176",
        "reference_moiety": [
            "G"
        ],
        "short_name": "preQ0",
        "smile": "Nc1[nH]c(=O)c2c(c[n]([C@@H]3O[C@H](CO)[C@@H](O)[C@H]3O)c2n1)C#N"
    },
    "121": {
        "abbrev": "W",
        "formula": "C21H28N6O11",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 540.481,
        "mass_monoiso": 540.1816,
        "mass_prot": 541.1894,
        "name": "peroxywybutosine",
        "product_ions": "409",
        "reference_moiety": [
            "G"
        ],
        "short_name": "o2yW",
        "smile": "C[n]1c2c(nc[n]2[C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=O)[n]2c1nc(C)c2CC(OO)C(NC(OC)=O)C(OC)=O"
    },
    "122": {
        "abbrev": "\\",
        "formula": "C11H16N2O6",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 272.255,
        "mass_monoiso": 272.1008,
        "mass_prot": 273.1086,
        "name": "5,2'-O-dimethyluridine",
        "product_ions": "127",
        "reference_moiety": [
            "U"
        ],
        "short_name": "m5Um",
        "smile": "CO[C@H]1[C@H]([n]2c(=O)[nH]c(=O)c(C)c2)O[C@H](CO)[C@H]1O"
    },
    "123": {
        "abbrev": "\u2209",
        "formula": "C12H17N5O5",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 311.294,
        "mass_monoiso": 311.123,
        "mass_prot": 312.1308,
        "name": "7-aminomethyl-7-deazaguanosine",
        "product_ions": "180",
        "reference_moiety": [
            "G"
        ],
        "short_name": "preQ1",
        "smile": "Nc1[nH]c(=O)c2c(CN)c[n]([C@@H]3O[C@H](CO)[C@@H](O)[C@H]3O)c2n1"
    },
    "124": {
        "abbrev": "\u03b7",
        "formula": "C13H19N5O4",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 309.321,
        "mass_monoiso": 309.1437,
        "mass_prot": 310.1515,
        "name": "N6,N6,2'-O-trimethyladenosine",
        "product_ions": "164",
        "reference_moiety": [
            "A"
        ],
        "short_name": "m6,6Am",
        "smile": "CN(C)c1ncnc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1OC"
    },
    "125": {
        "abbrev": "\u21d3",
        "formula": "C12H15N5O5",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 309.278,
        "mass_monoiso": 309.1073,
        "mass_prot": 310.1151,
        "name": "N6-acetyladenosine",
        "product_ions": "178",
        "reference_moiety": [
            "A"
        ],
        "short_name": "ac6A",
        "smile": "CC(Nc1ncnc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O)=O"
    },
    "126": {
        "abbrev": "\u2260",
        "formula": "C16H23N5O5S",
        "lc_elution_comment": "after m6A (Kellner 2014)",
        "lc_elution_time": "3,19 (Kellner 2014)",
        "mass_avg": 397.449,
        "mass_monoiso": 397.142,
        "mass_prot": 398.1498,
        "name": "2-methylthio-N6-(cis-hydroxyisopentenyl) adenosine",
        "product_ions": "266",
        "reference_moiety": [
            "A"
        ],
        "short_name": "ms2io6A",
        "smile": "CC(CO)=CCNc1nc(SC)nc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
    },
    "127": {
        "abbrev": ":",
        "formula": "C11H15N5O4",
        "lc_elution_comment": "between A and m6A (Kellner 2014, Kellner 2014)",
        "lc_elution_time": "1,59 (Kellner 2014); 1,83 (Kellner 2014)",
        "mass_avg": 281.268,
        "mass_monoiso": 281.1124,
        "mass_prot": 282.1195,
        "name": "2'-O-methyladenosine",
        "product_ions": "136",
        "reference_moiety": [
            "A"
        ],
        "short_name": "Am",
        "smile": "CO[C@H]1[C@H]([n]2cnc3c2ncnc3N)O[C@H](CO)[C@H]1O"
    },
    "128": {
        "abbrev": "\u2264",
        "formula": "C11H14N4O5",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 282.253,
        "mass_monoiso": 282.0964,
        "mass_prot": 283.1042,
        "name": "2'-O-methylinosine",
        "product_ions": "137",
        "reference_moiety": [
            "A"
        ],
        "short_name": "Im",
        "smile": "CO[C@H]1[C@H]([n]2cnc3c2nc[nH]c3=O)O[C@H](CO)[C@H]1O"
    },
    "129": {
        "abbrev": "{",
        "formula": "C11H17N3O6",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 287.269,
        "mass_monoiso": 287.1117,
        "mass_prot": 288.1195,
        "name": "5-methylaminomethyluridine",
        "product_ions": "156/239/257/125/209",
        "reference_moiety": [
            "U"
        ],
        "short_name": "mnm5U",
        "smile": "CNCc1c(=O)[nH]c(=O)[n]([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)c1"
    },
    "130": {
        "abbrev": "6",
        "formula": "C15H21N7O7",
        "lc_elution_comment": "between A and m6A (Kellner 2014)",
        "lc_elution_time": "1,62 (Kellner 2014)",
        "mass_avg": 411.37,
        "mass_monoiso": 411.1343,
        "mass_prot": 412.1421,
        "name": "N6-threonylcarbamoyladenosine",
        "product_ions": "281",
        "reference_moiety": [
            "A"
        ],
        "short_name": "t6A",
        "smile": "CC(O)C(N)C(NC(Nc1ncnc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O)=O)=O"
    },
    "131": {
        "abbrev": "\u00e2",
        "formula": "C11H15N5O4",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 281.268,
        "mass_monoiso": 281.1124,
        "mass_prot": 282.1202,
        "name": "8-methyladenosine",
        "product_ions": "150",
        "reference_moiety": [
            "A"
        ],
        "short_name": "m8A",
        "smile": "Cc1nc2c(N)ncnc2[n]1[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
    },
    "132": {
        "abbrev": "\u00a9",
        "formula": "C16H23N5O17P3",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 650.298,
        "mass_monoiso": 455.0243,
        "mass_prot": null,
        "name": "N7-methyl-guanosine cap (cap 0)",
        "product_ions": "",
        "reference_moiety": [
            "A",
            "U",
            "C",
            "G"
        ],
        "short_name": "m7GpppN",
        "smile": "C[n+]1c[n]([C@@H]2O[C@H](COP([O-])(OP([O-])(OP([O-])(OC[C@H]3O[C@@H]%91[C@H](O)[C@@H]3O)=O)=O)=O)[C@@H](O)[C@H]2O)c2c1c(nc(N)[nH]2)=O.[*]%91"
    },
    "133": {
        "abbrev": "\u00ae",
        "formula": "C17H25N5O17P3",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 664.325,
        "mass_monoiso": 469.04,
        "mass_prot": null,
        "name": "N2,7-dimethylguanosine cap (cap DMG)",
        "product_ions": null,
        "reference_moiety": [
            "A",
            "U",
            "C",
            "G"
        ],
        "short_name": "m2,7GpppN",
        "smile": "CNc1nc(=O)c2c([n](c[n+]2C)[C@@H]2O[C@H](COP([O-])(OP([O-])(OP([O-])(OC[C@H]3O[C@@H]%91[C@H](O)[C@@H]3O)=O)=O)=O)[C@@H](O)[C@H]2O)[nH]1.[*]%91"
    },
    "134": {
        "abbrev": "\u00b6",
        "formula": "C18H27N5O17P3",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 678.352,
        "mass_monoiso": 483.0556,
        "mass_prot": null,
        "name": "N2,N2,7-trimethylguanosine cap (cap TMG)",
        "product_ions": null,
        "reference_moiety": [
            "A",
            "U",
            "C",
            "G"
        ],
        "short_name": "m2,2,7GpppN",
        "smile": "CN(C)c1nc(=O)c2c([n](c[n+]2C)[C@@H]2O[C@H](COP([O-])(OP([O-])(OP([O-])(OC[C@H]3O[C@@H]%91[C@H](O)[C@@H]3O)=O)=O)=O)[C@@H](O)[C@H]2O)[nH]1.[*]%91"
    },
    "135": {
        "abbrev": "\u00a7",
        "formula": "C6H11O13P3",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 384.065,
        "mass_monoiso": 172.9405,
        "mass_prot": null,
        "name": "gamma-methyltriphosphate 5' cap",
        "product_ions": "",
        "reference_moiety": [
            "A",
            "U",
            "C",
            "G"
        ],
        "short_name": "mpppN",
        "smile": "COP([O-])(OP([O-])(OP([O-])(OC[C@H]1O[C@@H]%91[C@H](O)[C@@H]1O)=O)=O)=O.[*]%91"
    },
    "136": {
        "abbrev": "\u00b1",
        "formula": "C12H17N5O4",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 295.294,
        "mass_monoiso": 295.1281,
        "mass_prot": 296.1358,
        "name": "2,8-dimethyladenosine",
        "product_ions": "164",
        "reference_moiety": [
            "A"
        ],
        "short_name": "m2,8A",
        "smile": "Cc1nc2c(N)nc(C)nc2[n]1[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
    },
    "137": {
        "abbrev": "\u00d0",
        "formula": "C13H21N3O8",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 347.321,
        "mass_monoiso": 347.1329,
        "mass_prot": 348.1407,
        "name": "3-(3-amino-3-carboxypropyl)-5,6-dihydrouridine",
        "product_ions": "216",
        "reference_moiety": [
            "U"
        ],
        "short_name": "acp3D",
        "smile": "NC(CCN1C(=O)N([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)CCC1=O)C(O)=O"
    },
    "138": {
        "abbrev": "\u00de",
        "formula": "C13H19N3O8",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 345.305,
        "mass_monoiso": 345.1172,
        "mass_prot": 346.125,
        "name": "3-(3-amino-3-carboxypropyl)pseudouridine",
        "product_ions": "214",
        "reference_moiety": [
            "U"
        ],
        "short_name": "acp3Y",
        "smile": "NC(C(=O)O)CC[n]1c(=O)c([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)c[nH]c1=O"
    },
    "139": {
        "abbrev": "\u20ac",
        "formula": "C14H17N5O5",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 335.315,
        "mass_monoiso": 335.123,
        "mass_prot": 336.1308,
        "name": "wyosine",
        "product_ions": "204",
        "reference_moiety": [
            "G"
        ],
        "short_name": "imG",
        "smile": "C[n]1c2c(nc[n]2[C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=O)[n]2cc(C)nc12"
    },
    "140": {
        "abbrev": ".",
        "formula": "",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 0.0,
        "mass_monoiso": 0.0,
        "mass_prot": null,
        "name": "unknown ribonucleoside residue",
        "product_ions": "",
        "reference_moiety": [
            "A",
            "U",
            "C",
            "G"
        ],
        "short_name": "N",
        "smile": ""
    },
    "141": {
        "abbrev": "\u00bf",
        "formula": "C14H25N7O4",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 355.393,
        "mass_monoiso": 355.1968,
        "mass_prot": 356.2046,
        "name": "agmatidine",
        "product_ions": "224",
        "reference_moiety": [
            "C"
        ],
        "short_name": "C+",
        "smile": "NC(NCCCCNc1nc(=N)cc[n]1[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O)=N"
    },
    "142": {
        "abbrev": "\u00e6",
        "formula": "C13H19N5O5",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 325.32,
        "mass_monoiso": 325.1386,
        "mass_prot": 326.1464,
        "name": "N2,7,2'-O-trimethylguanosine",
        "product_ions": "180",
        "reference_moiety": [
            "G"
        ],
        "short_name": "m2,7Gm",
        "smile": "[C@H]1([n]2c[n+](C)c3c2nc(nc3=O)NC)[C@H](OC)[C@H](O)[C@@H](CO)O1"
    },
    "143": {
        "abbrev": "\u00c7",
        "formula": "C9H13N3O6",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 259.216,
        "mass_monoiso": 259.0804,
        "mass_prot": 260.0877,
        "name": "5-hydroxycytidine",
        "product_ions": "128",
        "reference_moiety": [
            "C"
        ],
        "short_name": "ho5C",
        "smile": "Nc1nc(=O)[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)cc1O"
    },
    "144": {
        "abbrev": "\u00be",
        "formula": "C15H23N3O6",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 341.36,
        "mass_monoiso": 341.1587,
        "mass_prot": 342.1665,
        "name": "5-(isopentenylaminomethyl)uridine",
        "product_ions": "210",
        "reference_moiety": [
            "U"
        ],
        "short_name": "inm5U",
        "smile": "CC(=CCNCc1c(=O)[nH]c(=O)[n]([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)c1)C"
    },
    "145": {
        "abbrev": "\u00bc",
        "formula": "C16H25N3O6",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 355.386,
        "mass_monoiso": 355.1743,
        "mass_prot": 356.1821,
        "name": "5-(isopentenylaminomethyl)-2'-O-methyluridine",
        "product_ions": "210",
        "reference_moiety": [
            "U"
        ],
        "short_name": "inm5Um",
        "smile": "CO[C@H]1[C@H]([n]2c(=O)[nH]c(=O)c(CNCC=C(C)C)c2)O[C@H](CO)[C@H]1O"
    },
    "146": {
        "abbrev": "\u00bd",
        "formula": "C15H23N3O5S",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 357.425,
        "mass_monoiso": 357.1358,
        "mass_prot": 358.1436,
        "name": "5-(isopentenylaminomethyl)-2-thiouridine",
        "product_ions": "226",
        "reference_moiety": [
            "U"
        ],
        "short_name": "inm5s2U",
        "smile": "CC(=CCNCc1c(=O)[nH]c(=S)[n]([C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)c1)C"
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    "147": {
        "abbrev": "\u03d6",
        "formula": "C5H8O13P3",
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        "mass_avg": 369.031,
        "mass_monoiso": 157.917,
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        "product_ions": null,
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            "A",
            "U",
            "C",
            "G"
        ],
        "short_name": "pppN",
        "smile": "O[C@@H]1[C@H](O)[C@@H](COP([O-])(OP([O-])(OP([O-])([O-])=O)=O)=O)O[C@@H]%911.[*]%91"
    },
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        "abbrev": "\u03d1",
        "formula": "C15H20N5O17P3",
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        "lc_elution_time": "",
        "mass_avg": 635.264,
        "mass_monoiso": 440.0008,
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            "U",
            "C",
            "G"
        ],
        "short_name": "GpppN",
        "smile": "Nc1nc(=O)c2c([n](cn2)[C@@H]2O[C@H](COP([O-])(OP([O-])(OP([O-])(OC[C@H]3O[C@@H]%91[C@H](O)[C@@H]3O)=O)=O)=O)[C@@H](O)[C@H]2O)[nH]1.[*]%91"
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    "149": {
        "abbrev": "\u2660",
        "formula": "C26H40N7O19P3S",
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        "lc_elution_time": null,
        "mass_avg": 879.618,
        "mass_monoiso": 684.1254,
        "mass_prot": null,
        "name": "5' (3' -dephospho-CoA)",
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            "U",
            "C",
            "G"
        ],
        "short_name": "CoApN",
        "smile": "CC(C)(COP([O-])(OP([O-])(OC[C@H]1O[C@@H]([n]2cnc3c(N)ncnc23)[C@H](O)[C@@H]1OP([O-])(OC[C@H]1O[C@@H]%91[C@H](O)[C@@H]1O)=O)=O)=O)C(O)C(NCCC(NCCS)=O)=O.[*]%91"
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        "abbrev": "\u2663",
        "formula": "C28H42N7O20P3S",
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        "lc_elution_time": null,
        "mass_avg": 921.654,
        "mass_monoiso": 736.1778,
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        "name": "5' (3' -dephosphoacetyl-CoA)",
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            "U",
            "C",
            "G"
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        "short_name": "acCoApN",
        "smile": "CC(SCCNC(CCNC(C(O)C(C)(C)COP([O-])(OP([O-])(OC[C@H]1O[C@@H]([n]2cnc3c(N)ncnc23)[C@H](O)[C@@H]1OP([O-])(OC[C@H]1O[C@@H]%91[C@H](O)[C@@H]1O)=O)=O)=O)=O)=O)=O.[*]%91"
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        "abbrev": "\u2665",
        "formula": "C29H42N7O22P3S",
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        "lc_elution_time": null,
        "mass_avg": 965.664,
        "mass_monoiso": 780.1676,
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        "name": "5' (3' -dephosphomalonyl-CoA)",
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            "U",
            "C",
            "G"
        ],
        "short_name": "malonyl-CoApN",
        "smile": "CC(C)(COP([O-])(OP([O-])(OC[C@H]1O[C@@H]([n]2cnc3c(N)ncnc23)[C@H](O)[C@@H]1OP([O-])(OC[C@H]1O[C@@H]%91[C@H](O)[C@@H]1O)=O)=O)=O)C(O)C(NCCC(NCCSC(CC(O)=O)=O)=O)=O.[*]%91"
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        "abbrev": "\u2666",
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        "mass_monoiso": 793.1755,
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        "name": "5' (3' -dephosphosuccinyl-CoA)",
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            "A",
            "U",
            "C",
            "G"
        ],
        "short_name": "succinyl-CoApN",
        "smile": "CC(C)(COP([O-])(OP([O-])(OC[C@H]1O[C@@H]([n]2cnc3c(N)ncnc23)[C@H](O)[C@@H]1OP([O-])(OC[C@H]1O[C@@H]%91[C@H](O)[C@@H]1O)=O)=O)=O)C(O)C(NCCC(NCCSC(CCC(O)=O)=O)=O)=O.[*]%91"
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        "abbrev": "\u03d2",
        "formula": "C5H8O10P2",
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        "mass_avg": 290.059,
        "mass_monoiso": 78.9585,
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            "U",
            "C",
            "G"
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        "short_name": "ppN",
        "smile": "O[C@H]1[C@H]%91O[C@H](COP(OP(=O)([O-])[O-])(=O)[O-])[C@H]1O.[*]%91"
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        "abbrev": "\u039e",
        "formula": "C26H33N7O20P3",
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        "mass_avg": 856.496,
        "mass_monoiso": 661.0935,
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        "name": "5' nicotinamide adenine dinucleotide",
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            "U",
            "C",
            "G"
        ],
        "short_name": "NADpN",
        "smile": "NC(c1ccc[n+]([C@@H]2O[C@H](COP([O-])(OP([O-])(OC[C@H]3O[C@@H]([n]4cnc5c(N)ncnc45)[C@H](O)[C@@H]3OP([O-])(OC[C@H]3O[C@@H]%91[C@H](O)[C@@H]3O)=O)=O)=O)[C@@H](O)[C@H]2O)c1)=O.[*]%91"
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        "abbrev": "y",
        "formula": "C19H26N6O8",
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        "lc_elution_time": null,
        "mass_avg": 466.445,
        "mass_monoiso": 466.1812,
        "mass_prot": 467.189,
        "name": "methylated undermodified hydroxywybutosine",
        "product_ions": "335",
        "reference_moiety": [
            "G"
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        "short_name": "OHyWy",
        "smile": "C[n]1c2nc(C)c(CC(O)C(N)C(OC)=O)[n]2c(=O)c2nc[n]([C@@H]3O[C@H](CO)[C@@H](O)[C@H]3O)c12"
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        "abbrev": "none",
        "formula": "C15H19N5O14P2",
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        "lc_elution_time": "",
        "mass_avg": 555.284,
        "mass_monoiso": 362.0502,
        "mass_prot": null,
        "name": "guanosine added to any ribonucleotide",
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            "A",
            "U",
            "C",
            "G"
        ],
        "short_name": "pG(pN)",
        "smile": "Nc1[nH]c2c(nc[n]2[C@H]2[C@H](O)[C@H](OP(OC[C@@H]3[C@@H](O)[C@@H](O)[C@H]%91O3)(=O)[O-])[C@@H](COP(=O)([O-])[O-])O2)c(=O)n1.[*]%91"
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        "abbrev": "l",
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        "lc_elution_time": null,
        "mass_avg": 317.318,
        "mass_monoiso": 317.0681,
        "mass_prot": 318.0759,
        "name": "5-carbamoylmethyl-2-thiouridine",
        "product_ions": "186/169/141",
        "reference_moiety": [
            "U"
        ],
        "short_name": "ncm5s2U",
        "smile": "NC(Cc1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=S)[nH]c1=O)=O"
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    "163": {
        "abbrev": "r",
        "formula": "C11H15N3O8",
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        "mass_avg": 317.252,
        "mass_monoiso": 317.0859,
        "mass_prot": 318.0937,
        "name": "5-carbamoylhydroxymethyluridine",
        "product_ions": "186/169/141",
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        ],
        "short_name": "nchm5U",
        "smile": "NC(C(O)c1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=O)[nH]c1=O)=O"
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        "abbrev": "b",
        "formula": "C13H18N2O9",
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        "mass_avg": 346.29,
        "mass_monoiso": 346.1012,
        "mass_prot": 347.109,
        "name": "5-(carboxyhydroxymethyl)-2'-O-methyluridine methyl ester",
        "product_ions": "201",
        "reference_moiety": [
            "U"
        ],
        "short_name": "mchm5Um",
        "smile": "COC(C(O)c1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2OC)c(=O)[nH]c1=O)=O"
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        "formula": "C5H8O7P",
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        "mass_avg": 211.087,
        "mass_monoiso": 211.0008,
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        "name": "unknown 5' monophosphate ribonucleotide",
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            "A",
            "U",
            "C",
            "G"
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        "short_name": "pN",
        "smile": "O[C@@H]1[C@H](O)[C@@H](COP([O-])([O-])=O)O[C@@H]%911.[*]%91"
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        "abbrev": "\u0393",
        "formula": "C19H28N2O5S",
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        "lc_elution_time": null,
        "mass_avg": 396.501,
        "mass_monoiso": 396.1719,
        "mass_prot": 397.1797,
        "name": "2-geranylthiouridine",
        "product_ions": "265",
        "reference_moiety": [
            "U"
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        "short_name": "ges2U",
        "smile": "CC(C)=CCC/C(/C)=C/CSc1nc(=O)cc[n]1[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
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        "formula": "C22H33N3O7S",
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        "mass_avg": 483.578,
        "mass_monoiso": 483.2039,
        "mass_prot": 484.2117,
        "name": "5-carboxymethylaminomethyl-2-geranylthiouridine",
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        "reference_moiety": [
            "U"
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        "short_name": "cmnm5ges2U",
        "smile": "CC(C)=CCC/C(/C)=C/CSc1nc(=O)c(CNCC(O)=O)c[n]1[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
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        "abbrev": "h",
        "formula": "C21H33N3O5S",
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        "mass_avg": 439.569,
        "mass_monoiso": 439.2141,
        "mass_prot": 440.2219,
        "name": "5-methylaminomethyl-2-geranylthiouridine",
        "product_ions": "308",
        "reference_moiety": [
            "U"
        ],
        "short_name": "mnm5ges2U",
        "smile": "CC(C)=CCC/C(/C)=C/CSc1nc(=O)c(CNC)c[n]1[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
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        "abbrev": "\u0394",
        "formula": "C20H31N3O5S",
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        "mass_avg": 425.542,
        "mass_monoiso": 425.1984,
        "mass_prot": 426.2062,
        "name": "5-aminomethyl-2-geranylthiouridine",
        "product_ions": "294",
        "reference_moiety": [
            "U"
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        "short_name": "nm5ges2U",
        "smile": "CC(C)=CCC/C(/C)=C/CSc1nc(=O)c(CN)c[n]1[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
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        "formula": "C7H14O7P",
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        "mass_avg": 241.156,
        "mass_monoiso": 241.0477,
        "mass_prot": null,
        "name": "alpha-dimethylmonophosphate 5' cap",
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            "A",
            "U",
            "C",
            "G"
        ],
        "short_name": "mmpN",
        "smile": "COP(OC)(OC[C@H]1O[C@@H]%91[C@H](O)[C@@H]1O)=O.[*]%91"
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    "171": {
        "abbrev": "",
        "formula": "C6H11O7P",
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        "mass_avg": 226.121,
        "mass_monoiso": 226.0242,
        "mass_prot": null,
        "name": "alpha-methylmonophosphate 5' cap",
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            "A",
            "U",
            "C",
            "G"
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        "short_name": "mpN",
        "smile": "COP([O-])(OC[C@H]1O[C@@H]%91[C@H](O)[C@@H]1O)=O.[*]%91"
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    "173": {
        "abbrev": "",
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        "name": "5' hydroxyl end",
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            "A",
            "U",
            "C",
            "G"
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        "short_name": "5'-OH-N",
        "smile": ""
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    "174": {
        "abbrev": "",
        "formula": "C5H6O9P2",
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        "lc_elution_time": null,
        "mass_avg": 272.043,
        "mass_monoiso": null,
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        "name": "2'3'-cyclic phosphate end",
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            "A",
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            "C",
            "G"
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        "short_name": "N2'3'cp",
        "smile": "[O-]P([O-])(OC[C@H]1O[C@@H]%91[C@@H]2OP([O-])(O[C@H]12)=O)=O.[*]%91"
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        "abbrev": "e",
        "formula": "C15H18N6O7",
        "lc_elution_comment": "between G and A (Kellner 2014); between A and m6A (Kellner 2014);",
        "lc_elution_time": "1,28 (Kellner 2014); 1,47 (Kellner 2014); 1,83 (Kellner 2014)",
        "mass_avg": 394.339,
        "mass_monoiso": 394.1237,
        "mass_prot": 395.1315,
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        "product_ions": "263",
        "reference_moiety": [
            "A"
        ],
        "short_name": "ct6A",
        "smile": "CC(O)C1NC(=Nc2ncnc3c2nc[n]3[C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)OC1=O"
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        "abbrev": "\u03ea",
        "formula": "C11H15N5O5",
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        "lc_elution_time": "",
        "mass_avg": 297.267,
        "mass_monoiso": 297.1073,
        "mass_prot": 298.1151,
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        "product_ions": "268/136",
        "reference_moiety": [
            "A"
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        "short_name": "hm6A",
        "smile": "O[C@H]1[C@H]([n]2cnc3c(NCO)ncnc23)O[C@H](CO)[C@H]1O"
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    "177": {
        "abbrev": "\u03e8",
        "formula": "C11H13N5O5",
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        "lc_elution_time": null,
        "mass_avg": 295.251,
        "mass_monoiso": 295.0917,
        "mass_prot": 296.0995,
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        "product_ions": "164",
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            "A"
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        "short_name": "f6A",
        "smile": "OC[C@H]1O[C@@H]([n]2cnc3c(NC=O)ncnc23)[C@H](O)[C@@H]1O"
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        "abbrev": "\u0476",
        "formula": "C11H13N3O6",
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        "mass_avg": 283.237,
        "mass_monoiso": 283.0804,
        "mass_prot": 284.0882,
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        "product_ions": "152",
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            "U"
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        "short_name": "cnm5U",
        "smile": "N#CCc1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=O)[nH]c1=O"
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        "abbrev": "\u03ff",
        "formula": "C13H18N2O9",
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        "lc_elution_time": "",
        "mass_avg": 346.29,
        "mass_monoiso": 346.1012,
        "mass_prot": null,
        "name": "2'-O-methyluridine 5-oxyacetic acid methyl ester",
        "product_ions": "",
        "reference_moiety": [
            "U"
        ],
        "short_name": "mcmo5Um",
        "smile": "COC(COc1c[n]([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2OC)c(=O)[nH]c1=O)=O"
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        "abbrev": "\u00ff",
        "formula": "C17H21N5O7S",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 439.443,
        "mass_monoiso": 439.1162,
        "mass_prot": null,
        "name": "2-methylthio cyclic N6-threonylcarbamoyladenosine",
        "product_ions": null,
        "reference_moiety": [
            "A"
        ],
        "short_name": "ms2ct6A",
        "smile": "CSc1nc2c(nc[n]2[C@H]2[C@H](O)[C@H](O)[C@@H](CO)O2)c(C2C(=O)[C@H]([C@H](O)C)NC2=O)n1"
    },
    "181": {
        "abbrev": "\u00ab",
        "formula": "C15H20N6O9",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 428.354,
        "mass_monoiso": 428.1292,
        "mass_prot": null,
        "name": "hydroxy-N6-threonylcarbamoyladenosine",
        "product_ions": null,
        "reference_moiety": [
            "A"
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        "short_name": "ht6A",
        "smile": "OC(C(NC(Nc1ncnc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O)=O)C(O)CO)=O"
    },
    "182": {
        "abbrev": "\u00a3",
        "formula": "C17H25N5O4S2",
        "lc_elution_comment": "after m6A",
        "lc_elution_time": "3.56",
        "mass_avg": 427.542,
        "mass_monoiso": 427.1347,
        "mass_prot": 428.0,
        "name": "2- methylthiomethylenethio-N6-isopentenyl-adenosine",
        "product_ions": "",
        "reference_moiety": [
            "A"
        ],
        "short_name": "msms2i6A",
        "smile": "CC(C)=CCNc1nc(SCSC)nc2c1nc[n]2[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1O"
    },
    "183": {
        "abbrev": "\u00a1",
        "formula": "C11H17N3O6",
        "lc_elution_comment": "",
        "lc_elution_time": "",
        "mass_avg": 287.269,
        "mass_monoiso": 287.1117,
        "mass_prot": null,
        "name": "2'-O-methyl-5-hydroxymethylcytidine",
        "product_ions": "",
        "reference_moiety": [
            "C"
        ],
        "short_name": "hm5Cm",
        "smile": "CO[C@H]1[C@H]([n]2cc(CO)c(N)nc2=O)O[C@H](CO)[C@H]1O"
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    "185": {
        "abbrev": "",
        "formula": "C9H11N2O9P",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 322.165,
        "mass_monoiso": null,
        "mass_prot": null,
        "name": "pseudouridine-5'-monophosphate",
        "product_ions": null,
        "reference_moiety": [
            "U"
        ],
        "short_name": "pY",
        "smile": "O=c1[nH]cc([C@@H]2O[C@H](COP(=O)([O-])[O-])[C@@H](O)[C@H]2O)c(=O)[nH]1"
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    "186": {
        "abbrev": "",
        "formula": "C10H14N3O8P",
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        "lc_elution_time": null,
        "mass_avg": 335.207,
        "mass_monoiso": null,
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            "U"
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        "smile": "CC(=CCNc1ncnc2c1nc[n]2[C@@H]1O[C@H](COP(=O)([O-])[O-])[C@@H](O)[C@H]1O)CO"
    },
    "433": {
        "abbrev": "",
        "formula": "C12H14N5O8P",
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        "lc_elution_time": null,
        "mass_avg": 387.242,
        "mass_monoiso": null,
        "mass_prot": null,
        "name": "N6-acetyladenosine-5'-monophospate",
        "product_ions": null,
        "reference_moiety": [
            "A"
        ],
        "short_name": "pac6A",
        "smile": "CC(=O)Nc1ncnc2c1nc[n]2[C@@H]1O[C@H](COP(=O)([O-])[O-])[C@@H](O)[C@H]1O"
    },
    "434": {
        "abbrev": "",
        "formula": "C11H12N5O8P",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 373.215,
        "mass_monoiso": null,
        "mass_prot": null,
        "name": "N6-formyladenosine-5'-monophospate",
        "product_ions": null,
        "reference_moiety": [
            "A"
        ],
        "short_name": "pf6A",
        "smile": "O=CNc1ncnc2c1nc[n]2[C@@H]1O[C@H](COP(=O)([O-])[O-])[C@@H](O)[C@H]1O"
    },
    "435": {
        "abbrev": "",
        "formula": "C13H15N6O10P",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 446.266,
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        "mass_prot": null,
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        "reference_moiety": [
            "A"
        ],
        "short_name": "pg6A",
        "smile": "O=C(O)CNC(=O)Nc1ncnc2c1nc[n]2[C@@H]1O[C@H](COP(=O)([O-])[O-])[C@@H](O)[C@H]1O"
    },
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        "abbrev": "",
        "formula": "C11H14N5O8P",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 375.231,
        "mass_monoiso": null,
        "mass_prot": null,
        "name": "N6-hydroxymethyladenosine-5'-monophosphate",
        "product_ions": null,
        "reference_moiety": [
            "A"
        ],
        "short_name": "phm6A",
        "smile": "O=P([O-])([O-])OC[C@H]1O[C@@H]([n]2cnc3c(NCO)ncnc23)[C@H](O)[C@@H]1O"
    },
    "437": {
        "abbrev": "",
        "formula": "C16H21N6O11P",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 504.345,
        "mass_monoiso": null,
        "mass_prot": null,
        "name": "N6-hydroxynorvalylcarbamoyladenosine-5'-monophosphate",
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        "reference_moiety": [
            "A"
        ],
        "short_name": "phn6A",
        "smile": "CCC(O)C(NC(=O)Nc1ncnc2c1nc[n]2[C@@H]1O[C@H](COP(=O)([O-])[O-])[C@@H](O)[C@H]1O)C(=O)O"
    },
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        "abbrev": "",
        "formula": "C12H16N5O8P",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 389.258,
        "mass_monoiso": null,
        "mass_prot": null,
        "name": "N2,7-dimethylguanosine-5'-monophosphate",
        "product_ions": null,
        "reference_moiety": [
            "G"
        ],
        "short_name": "pm2,7G",
        "smile": "CNc1nc(=O)c2c([n]([C@H]3[C@H](O)[C@H](O)[C@@H](COP(=O)([O-])[O-])O3)c[n+]2C)n1"
    },
    "441": {
        "abbrev": "",
        "formula": "C13H18N5O8P",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 403.284,
        "mass_monoiso": null,
        "mass_prot": null,
        "name": "N2,N2,7-trimethylguanosine-5'-monophosphate",
        "product_ions": null,
        "reference_moiety": [
            "G"
        ],
        "short_name": "pm2,2,7G",
        "smile": "CN(c1nc(=O)c2c([n]([C@H]3[C@H](O)[C@H](O)[C@@H](COP(=O)([O-])[O-])O3)c[n+]2C)n1)C"
    },
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        "abbrev": "",
        "formula": "C13H18N5O8P",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 403.284,
        "mass_monoiso": null,
        "mass_prot": null,
        "name": "N2,7,2'-O-trimethylguanosine-5'-monophosphate",
        "product_ions": null,
        "reference_moiety": [
            "G"
        ],
        "short_name": "pm2,7Gm",
        "smile": "CNc1nc(=O)c2c([n]([C@H]3[C@H](OC)[C@H](O)[C@@H](COP(=O)([O-])[O-])O3)c[n+]2C)n1"
    },
    "443": {
        "abbrev": "",
        "formula": "C9H10BrN2O8P",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 385.062,
        "mass_monoiso": null,
        "mass_prot": null,
        "name": "[(2R,3S,5R)-5-(5-Bromo-2,4-dioxopyrimidin-1-yl)-3-hydroxyoxolan-2-yl]methyl phosphate\n",
        "product_ions": null,
        "reference_moiety": [
            "U"
        ],
        "short_name": "",
        "smile": "O[C@@H]1[C@@H](COP(=O)([O-])[O-])O[C@@H]([n]2c(=O)[nH]c(=O)c(Br)c2)C1"
    },
    "444": {
        "abbrev": "",
        "formula": "C10H12N5O7P",
        "lc_elution_comment": null,
        "lc_elution_time": null,
        "mass_avg": 345.205,
        "mass_monoiso": null,
        "mass_prot": null,
        "name": "adenosine-5'-monophosphate",
        "product_ions": null,
        "reference_moiety": [
            "A"
        ],
        "short_name": "pA ",
        "smile": "Nc1c2c([n]([C@H]3[C@H](O)[C@H](O)[C@@H](COP(=O)([O-])[O-])O3)cn2)ncn1"
    }
}