O=C(CCc1nnc2s/c(=C\c3ccc([N+](=O)[O-])cc3)c(=O)n12)Nc1ccc(Cl)c(Cl)c1
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?