2,3-Diamino­pyridinium 4-carb­oxy­butano­ate

In the title mol­ecular salt, C(5)H(8)N(3) (+)·C(5)H(7)O(4) (−), the 2,3-diamino­pyridine mol­ecule is protonated at the pyridine N atom. The cation is essentially planar, with a maximum deviation of 0.015 (2) Å, and the anion adopts an extended conformation. In the crystal, the hydrogen glutarate (4-carb­oxy­butano­ate) anions are self-assembled through O—H⋯O hydrogen bonds, forming chains. The cations are connected to the anion chains via N—H⋯O hydrogen bonds, forming a three-dimensional network. The crystal structure also features aromatic π–π inter­actions between the pyridinium cations, with a centroid–centroid distance of 3.4464 (10) Å.