:term:`DO_SOS <DO_SOS (DFOCC)>`
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      Do perform spin-opposite-scaled OMP2 (SOS-OMP2)? In all computation, SOS-OMP2 energy is computed automatically. However, in order to perform geometry optimizations and frequency computations with SOS-OMP2, one needs to set 'DO_SOS' to true

      * **Type**: :ref:`boolean <op_c_boolean>`
      * **Default**: false

