Br.COc1cc(NS(=O)(=O)c2ccc(Nc3nc(-c4cccc([N+](=O)[O-])c4)cs3)cc2)nc(OC)n1
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?