O=S(=O)([O-])c1ccc2c(/N=N\c3cccc4ccccc34)c(O)c(S(=O)(=O)O)cc2c1.[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?