O=C(c1c(Cl)cc(Cl)cc1Cl)N(Cc1cccnc1)C(=S)N(Cc1cccnc1)C(=O)c1c(Cl)cc(Cl)cc1Cl
PSA is a commonly used medicinal chemistry metric for the optimization of a drug's ability to permeate cells. Please predict psa of this molecule.