C[C@@H]1CC[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@]43C)[C@H]2[C@@H]1C
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?