CSc1nc(N)c2ncn([C@@H]3O[C@H](COP(=O)([O-])OP(=O)([O-])[O-])[C@H](O)[C@H]3O)c2n1.[Na+].[Na+].[Na+]
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?