Cc1ccc(C2c3c(C)nn(-c4ccc([N+](=O)[O-])cc4)c3N=C3C(=O)Nc4ccccc4N32)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?