O=C(OCC(=O)c1ccc([N+](=O)[O-])cc1)/C(=C/c1ccc(Cl)cc1)NC(=O)c1ccccc1
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?