COc1cc([C@@H]2OC(=O)C3C2C(=O)O[C@H]3c2cc(OC)c(OC)c(OC)c2)cc(OC)c1OC
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?