O=C1N[C@@H](Cc2cn(S(=O)(=O)c3ccc([N+](=O)[O-])cc3)c3ccccc23)C(=O)N[C@H]1Cc1ccccc1
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.