CC1(C)O[C@H]2CC(=O)OC[C@@]23C1CC(=O)[C@]1(C)C3CC[C@@]2(C)[C@H](c3ccoc3)OC(=O)[C@H]3O[C@]321
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?