C[C@H]1[C@H](C)CC[C@@]2(C(=O)O)CC[C@]3(C)C(=CC[C@H]4[C@]3(C)CC[C@H]3C(C)(C)[C@@H](O)CC[C@@]34C)[C@@H]12
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?