CC[C@@H]1CC[C@@H]2[C@H](CC[C@]3(C)[C@@H](O[N+](=O)[O-])CC[C@@H]23)[C@H]1C(C)=O
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?