O=C(O)C1=CC[C@@H](c2ccc(Cl)cc2)N(S(=O)(=O)c2ccc(Cl)cc2)[C@H]1c1ccc(F)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?