2-Amino-5-bromopyridinium 3-carboxyprop-2-enoate

In the title salt, C5H6BrN2+·C4H3O4 , the 2-amino-5-bromopyridinium cation and hydrogen maleate anion are planar, with maximum deviations from their mean planes of 0.016 (1) and 0.039 (1) , respectively. An intramolecular O—H...O hydrogen bond generates an S(7) ring motif in the anion. In the crystal, the protonated N atom and the 2-amino group of the cation are hydrogen-bonded to the carboxylate O atoms of the anion via a pair of N—H...O hydrogen bonds, forming an R22(8) ring motif. The motifs are linked into a two-dimensional network parallel to (011) by N—H...O and C—H...O hydrogen bonds.