C[C@]12C=CC(=O)C=C1CC[C@@H]1[C@H]3C[C@@H](O)[C@](O)(C(=O)CO)[C@]3(C)C[C@H](O)[C@]12F
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?