O=C(Nc1ncc(Cc2ccc(C(F)(F)F)cc2)s1)c1ccc(-c2cccc([N+](=O)[O-])c2)o1
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?