memory 1 GB

#  O        1.8209061506       -0.1168722551        0.8797224426
#  H        1.3210490208        0.1080495668        1.6713460442
#  O       -1.0307177917        0.9706229916        0.6160292381
#  C        0.8925414337       -0.2929242467       -0.1665345356
#  C       -0.0873623020       -1.4605459113        0.0634922449
#  C       -1.3776609923       -1.0837745537       -0.6787441717
#  C       -1.3676697197        0.4275811219       -0.6560452876
#  C       -0.0124858813        0.8988893452       -0.3797241260
#  H       -2.0802936848        1.0071856067       -1.2278546302
#  H       -1.3527793900       -1.4167240436       -1.7180219444
#  H       -2.2700606824       -1.5035132797       -0.2156972031
#  H        0.3293749896       -2.4125909821       -0.2551944374
#  H       -0.2827022152       -1.5252643940        1.1332005380
#  H        1.4867736813       -0.4525394433       -1.0681908098
#  H        0.3792878134        1.8479209073       -0.7212426521

mol = psi4.core.Molecule.from_arrays(
    elez=[8, 1, 8, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1],
    fragment_separators=[2, 3],
    fix_com=True,
    fix_orientation=True,
    fix_symmetry='c1',
    fragment_multiplicities=[2, 3, 1],
    molecular_charge=0,
    molecular_multiplicity=1,
    geom= [
       1.8209061506   ,   -0.1168722551   ,    0.8797224426 ,
       1.3210490208   ,    0.1080495668   ,    1.6713460442 ,

      -1.0307177917   ,    0.9706229916   ,    0.6160292381 ,

       0.8925414337   ,   -0.2929242467   ,   -0.1665345356 ,
      -0.0873623020   ,   -1.4605459113   ,    0.0634922449 ,
      -1.3776609923   ,   -1.0837745537   ,   -0.6787441717 ,
      -1.3676697197   ,    0.4275811219   ,   -0.6560452876 ,
      -0.0124858813   ,    0.8988893452   ,   -0.3797241260 ,
      -2.0802936848   ,    1.0071856067   ,   -1.2278546302 ,
      -1.3527793900   ,   -1.4167240436   ,   -1.7180219444 ,
      -2.2700606824   ,   -1.5035132797   ,   -0.2156972031 ,
       0.3293749896   ,   -2.4125909821   ,   -0.2551944374 ,
      -0.2827022152   ,   -1.5252643940   ,    1.1332005380 ,
       1.4867736813   ,   -0.4525394433   ,   -1.0681908098 ,
       0.3792878134   ,    1.8479209073   ,   -0.7212426521 
       ])
activate(mol)

# => Standard Options <= #

set {
basis         jun-cc-pvdz
scf_type df
guess sad
freeze_core true
}

energy('fisapt0')