COc1ccccc1-c1ccc(O[C@@H]2OC(C)(C)[C@H](OC)[C@@H](O)[C@H]2O)cc1C(=O)NCc1ccccc1
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?