COC(=O)[C@@H](c1ccccc1)N(C)S(=O)(=O)c1cccc(S(=O)(=O)N(C)[C@@H](C(=O)OC)c2ccccc2)c1
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.