CC(=O)OCC(=O)[C@@]12OC(C)(C)O[C@@H]1C[C@H]1[C@H]3C[C@H](F)C4=CC(=O)C=C[C@@]4(C)[C@]3(F)[C@H](O)C[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?