Acta Cryst. (2012). E68, o3117 [ doi:10.1107/S1600536812041906 ]
Abstract: In the title molecular salt, C5H9N2+·C7H3N2O7-, the roughly planar anion (r.m.s. deviation = 0.120 Å) has been deprotonated at the phenol group. An intramolecular O-HO hydrogen bond in the anion generates an S(6) ring. In the crystal, the components are linked by cation-to-anion N-HO and N-H(O,O) hydrogen bonds, generating  double chains. Weak C-HO interactions consolidate the packing.
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