C[C@H]1CC[C@@]2(C)[C@@H](CC[C@H]3[C@@H]4CC[C@H](O)[C@@]4(C)CC[C@@H]32)C1
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?