O=C1/C(=C\c2ccc(O)c(O)c2)Oc2c1ccc(O[C@@H]1O[C@H](CO)[C@@H](O)[C@H](O)[C@H]1O)c2O
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?