C[C@]1(O)CC[C@H]2[C@H]3[C@H](CC[C@@]21C)[C@@]1(C)CCC(=O)C=C1C[C@H]3O
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?