psi4.set_memory('8GB')
psi4.core.set_num_threads(12)
molecule oxygen_dimer {
 0 3
 O 0.00000000 0.00000000 2.62151500
 O 0.00000000 0.00000000 1.37848500
 --
 0 3
 O 0.43947747 0.00000000 5.98947747
 O -0.43947747 0.00000000 5.11052253
}

set basis aug-cc-pVTZ

E = energy('MP2',molecule=oxygen_dimer, bsse_type='cp')
Efinal = E* psi_hartree2kcalmol
psi4.print_out("MP2/aug-cc-pVTZ = ")
psi4.print_out("%10.6f" % (Efinal))