COC(=O)C1=CCC[C@H]2[C@@]1(COC(C)=O)CC[C@@H](C)[C@]2(C)CC(=O)c1ccoc1
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?