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In the title mol­ecular salt, C 5 H 7 N 2+ ·C 12 H 8 ClN 4 O 7− , the dihedral angle between the aromatic rings of the anion is 51.88 (6)°. One of the nitro groups is disordered over two orientations in a 0.710 (6):0.290 (6) ratio. In the crystal, the cations and anions are linked by N—H⋯O hydrogen bonds, generating infinite ribbons extending along [100] which incorporate  R44 (22) ring motifs. Weak C—H⋯O inter­actions also occur.

2-Aminopyridinium 5-(5-chloro-2,4-dinitrophenyl)-1,3-dimethyl-2,4-dioxo-1,2,3,4-tetrahydropyrimidin-6-olate