C[C@]12CCC3C(CC[C@]4(O)CC(O)CC[C@@]34C=O)[C@]1(O)CCC2C1=CC(=O)OC1
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?