C=C(C)[C@@H](O)[C@H](O)C[C@H](C)C1CC[C@]2(C)C1=CC[C@@H]1[C@@]3(C)CC[C@@H](OC(C)=O)C(C)(C)[C@@H]3C[C@@H](OC3OC(COC(C)=O)C(O)C(O)C3O)[C@]12C
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?