CC(=O)OC1CC2C(C)(C)C(O)CC(OC(C)=O)[C@@]2(C)C2CC[C@@]3(C)C(c4ccoc4)OC(=O)C4OC43[C@]12C
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?