CCOC(=O)C1=C[C@@H](C2CCCC2)N(S(=O)(=O)c2ccc([N+](=O)[O-])cc2)[C@H]1c1ccccc1
Molecules with a polar surface area of greater than 140 angstroms squared (Å2) tend to be poor at permeating cell membranes. What's the psa of this molecule?