COC(=O)C1=COC(OC2OC(CO)C(O)C(O)C2O)C2C3CN4CCc5c([nH]c6ccccc56)C4(CC12)O3
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?