Cc1ccc(N(C=O)c2c([N+](=O)[O-])cc([N+](=O)[O-])c3c2=[N+]([O-])CN=3)cc1
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?