2-(3-Amino­pyridinium-1-yl)-3-carb­oxy­propano­ate monohydrate

The title compound, C(9)H(10)N(2)O(4)·H(2)O, was obtained as a zwitterion derived from the nucleophilic attack of 3-amino­pyridine on the fumaric α,β-system. Within the molecule, the amino­pyridine moiety and the carboxyl­ate and carb­oxy­lic acid fragments form dihedral angles of 68.6 (2) and 62.8 (2)°, respectively. The geometry adopted by the mol­ecule does not allow the formation of centrosymmetric dimeric hydrogen-bonded units; instead chains along the a axis are linked by COO—H⋯OOC motifs. These chains are inter­connected by N—H⋯O and O—H⋯O hydrogen bonds involving the carb­oxy­lic acid and carboxyl­ate units and the solvent water mol­ecules.