Cc1ccc(S(=O)(=O)N2C[C@H]3N(C(=O)OC(C)C)N(C(=O)OC(C)C)C[C@H](OC(=O)NCC4CCCCC4)[C@@]3(O)C2)cc1
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.