2-Amino-5-methyl­pyridinium 4-carb­oxy­butano­ate

In the title salt, C(6)H(9)N(2) (+)·C(5)H(7)O(4) (−), the 2-amino-5-methyl­pyridinium cation is essentially planar, with a maximum deviation of 0.008 (1) Å. In the crystal, the protonated N atom and the 2-amino group are hydrogen bonded to the carboxyl­ate O atoms via a pair of N—H⋯O hydrogen bonds, forming an R (2) (2)(8) ring motif. The 4-carb­oxy­butano­ate anions are linked via O—H⋯O hydrogen bonds. The crystal structure is further stabilized by weak C—H⋯O inter­actions.