Nc1ncnc2c1nc(Sc1ccc(Cl)cc1)n2[C@@H]1O[C@H]2COP(=O)([O-])O[C@@H]2[C@H]1O.[Na+]
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?