CN[C@@H](C)C(=O)N[C@H](C(=O)N[C@@H](CCCNC(=O)OCc1ccccc1)C(=O)NC1CCCc2ccccc21)C(C)C.O=CO
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.