CC(=O)O[C@H]1CC[C@@]2(C)C(CC[C@]3(C)C2CC[C@]2(C)Oc4c(C)cc(O)cc4C[C@@H]23)C1(C)C
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?