2-(2,4-Dinitrobenzyl)pyridinium 2-hydroxy-3,5-dinitrobenzoate

In the structure of the title salt, C12H10N3O4+·C7H3N2O7 , the cations and the anions are linked by a single N+—H...Ocarboxyl hydrogen bond, the discrete cation–anion unit having no intermolecular associations other than weak cation–anion aromatic ring π–π interactions [ring centroid separation = 3.7320 (14) ] and a number of weak inter-unit aromatic C—H...O contacts. An intramolecular C—H...O hydroxyl–carboxyl hydrogen bond occurs in the anion.