CC(=O)C(C(=O)c1ccc(C)cc1)[C@H]1OC(C)(C)O[C@H]1[C@H]1COC(C)(C)O1
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?