C=C1CC2OC2(C(=O)O[C@H]2CCC3[C@@H]4CCC5=CC(=O)CC[C@]5(C)C4CC[C@@]32C)C1=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?