CNc1ncnc2c1ncn2[C@H]1C[C@H](OP(=O)([O-])[O-])[C@@H](COP(=O)([O-])[O-])O1.[Na+].[Na+].[Na+].[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?