CCOC(=O)N/N=C1/C[C@@H](O)[C@@H](O)[C@H]2[C@@H]1CC[C@@H]1C(=O)N([C@@H](C)c3ccccc3)C(=O)[C@H]12
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.