COc1ccc(O[C@H]2C=C[C@@H](c3ccccc3)O[C@H]2COC(=O)NCc2cccc3ccccc23)cc1
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?