O=C(c1ccccc1NS(=O)(=O)c1ccc([N+](=O)[O-])cc1[N+](=O)[O-])N1O[C@@H]2C=C[C@H]1C2
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?