C[C@H](O)[C@@H]1CN2CCc3c([nH]c4ccc(-c5ccc6c(c5)OCO6)cc34)[C@@H]2C[C@@H]1N(C)C(=O)Nc1cc(Cl)cc(Cl)c1
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.