O=c1/c(=C/c2ccc([N+](=O)[O-])o2)sc2n1[C@@H](c1ccc(Cl)cc1)C=C(c1cc(F)c(Cl)cc1Cl)N=2
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?