C=C1C(=O)O[C@H]2[C@@H](C)CCC/C(C)=C\CC[C@@](C)(O)[C@@H]3C[C@@H]1[C@H]2O3
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?