2-Amino-5-methyl­pyridinium 2-carb­oxy­acetate

In the title mol­ecular salt, C(6)H(9)N(2) (+)·C(3)H(3)O(4) (−), the cation is essentially planar, with a maximum deviation of 0.010 (3) Å. In the anion, an intra­molecular O—H⋯O hydrogen bond generates an S(6) ring and results in a folded conformation. In the crystal, the protonated NH group 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 R (2) (2)(8) ring motif. Weak inter­molecular C—H⋯O inter­actions help to further stabilize the crystal structure.