O=C(NCCN1C(=O)S/C(=C\c2ccc(Cl)c(Cl)c2)C1=O)c1ccc2c(c1)C(=O)N(Cc1ccncc1)C2=O
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.