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In the title mol­ecular salt, C 5 H 9 N 2   + ·C 7 H 3 N 2 O 7   − , the roughly planar anion (r.m.s. deviation = 0.120 Å) has been deprotonated at the phenol group. An intra­molecular O—H⋯O hydrogen bond in the anion generates an  S (6) ring. In the crystal, the components are linked by cation-to-anion N—H⋯O and N—H⋯(O,O) hydrogen bonds, generating [010] double chains. Weak C—H⋯O inter­actions consolidate the packing.

3,5-Dimethylpyrazolium 3,5-dinitrosalicylate