O=c1c2c(O)cc(O)cc2oc2c(O)ccc(O[C@H]3O[C@@H](CO)[C@H](O)[C@@H](O)[C@@H]3O)c12
Molecules with a polar surface area of greater than 60 angstroms squared (Å2) is hard to pass brain blood barrier. What's the psa of this molecule?