COC(=O)[C@@H]1C[C@@]2(O)[C@@H](O)[C@@H](O)[C@@H](O)C[C@H]2N1Cc1ccc(Cl)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?