CC(C)(C)N/N=C(\Cc1occc(=O)c1O)C(=O)Nc1ccc([N+](=O)[O-])cc1[N+](=O)[O-]
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?