COC(=O)[C@H]1C[C@H](OC(=O)NC2CC2)[C@@]2(O)CN(S(=O)(=O)c3ccc(C)cc3)CC2[C@H]1C(=O)OC
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?