CC(C)[C@@H](C(=O)N[C@@H](C(=O)O)c1ccccc1)N1C(=O)N2CCc3c([nH]c4ccccc34)[C@@]2(C)C1=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.