C=C1C[C@H](O)[C@H]2[C@H](C)C(=O)O[C@@H]2[C@H]2[C@H](C)[C@@H](O)C[C@@H]12
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?