CC1CC2C(C(O)C[C@]3(C)C2CC[C@]3(O)C(=O)CO)[C@]2(C)C=CC(=O)C=C12
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?