CC(=O)OC1CC(OC(C)=O)[C@]2(C)C(CC(=O)[C@]3(C)C2CC[C@@]2(C)C(C(=O)O)OC(=O)C4OC423)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?