CC(C)(O)[C@H]1O[C@@H]2CC[C@]3(C)[C@@]4(C)c5[nH]c6ccccc6c5C[C@@H]4CC[C@]3(O)C2=CC1=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?