CCCCCCSc1ccc([C@H]2N[C@@](CC(C)C)(C(=O)OC)[C@H]3C(=O)N(C)C(=O)[C@@H]23)cc1.O=C(O)C(F)(F)F
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.