O=c1ccn([C@@H]2O[C@@H](COP(=O)([O-])OP(=O)([O-])O)[C@H](O)[C@@H]2O)c(=O)[nH]1.[Na+].[Na+]
Hydrogen bond acceptor: The atom, ion, or molecule component of a hydrogen bond which does not supply the bridging (shared) hydrogen atom. How many hydrogen bond acceptors does the molecule have?