C=C1C(=O)C2=C[C@H]1C[C@H](O)C(=O)[C@]1(C)CCCC(C)(C)[C@H]1C[C@H]2O
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?