O=C(CSc1nnc(-c2cccc(S(=O)(=O)N3CCCC3)c2)n1-c1ccccc1)Nc1ccc(C(=O)O)cc1
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?