Nc1ncnc2c1nc(Br)n2[C@@H]1O[C@H]2COP(=O)([O-])O[C@@H]2[C@H]1O.[Na+]
The donor in a hydrogen bond is usually a strongly electronegative atom such as N, O, or F that is covalently bonded to a hydrogen bond. How many hydrogen bond donors does the molecule have?