COC(=O)C1=CO[C@@H](OC2OC(CO)C(O)C(O)C2O)[C@@H]2[C@H](C)[C@@H](O)[C@@H](O)[C@]12O
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?