CC(C)CO/N=C1/C[C@@H](O)[C@@H](O)[C@H]2[C@H]1CC[C@H]1C(=O)N(c3ccc(F)cc3F)C(=O)[C@H]21
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.