Crystal structure of 2-amino-4-methyl­pyridin-1-ium (2R,3R)-3-carb­oxy-2,3-di­hydroxy­propano­ate monohydrate

The title mol­ecular salt, C(6)H(9)N(2) (+)·C(4)H(5)O(6) (−)·H(2)O, crystallized with two 2-amino-4-methyl­pyridin-1-ium cations, two l-(+)-tartaric acid monoanions [systematic name: (2R,3R)-3-carb­oxy-2,3-di­hydroxy­propano­ate] and two water mol­ecules in the asymmetric unit. In the crystal, the cations, anions and water mol­ecules are linked via a number of O—H⋯O and N—H⋯O hydrogen bonds, and a C—H⋯O hydrogen bond, forming a three-dimensional structure