OC1c2ccccc2[C@@H]2[C@H]1[C@@H](c1ccccc1)C1(Cc3ccccc3C1O)[C@H]2c1ccccc1
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?