O=C(O)c1cccc(NS(=O)(=O)c2ccc(-c3ccc(S(=O)(=O)Nc4cccc(C(=O)O)c4)cc3)cc2)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?