CC(=O)OC1CC[C@]2(C)C(=CCC3C2CC[C@@]2(C)C(C(C)CCCC(C)C)CCC32)C1
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?