C[C@]1(O)CCC2[C@@H]3CCC4=C(O)C(=O)C(C=O)C[C@]4(C)C3CC[C@@]21C
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?