COC(=O)Cc1c(C2C(CC(=O)OC)c3ccccc3N2C2OC(CO)C(O)C(O)C2O)[nH]c2ccccc12
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?