Cc1c(C(=O)N(C)C)sc(NC(=O)c2cc([N+](=O)[O-])cc([N+](=O)[O-])c2)c1C#N
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?