CCN(CC)C(=O)[C@H]1C[C@H](CC(=O)NCc2ccco2)C(=O)N2CCc3c([nH]c4cc(CCC(=O)N(C)C)ccc34)[C@]12C
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.