COc1cc(/C=C2\Sc3scc(-c4cccc([N+](=O)[O-])c4)[n+]3C2=O)cc(OC)c1OC.[Cl-]
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?