Diaqua­bis­(5-carb­oxy-2-ethyl-1H-imidazole-5-carboxyl­ato-κ(2) N (3),O (4))zinc trihydrate

In the crystal structure of the title compound, [Zn(C(7)H(7)N(2)O(4))(2)(H(2)O)(2)]·3H(2)O, the Zn(II) ion, located an inversion center, is N,O-chelated by two 5-carb­oxy-2-ethyl-1H-imidazole-4-carboxyl­ate anions and further coordinated by two water mol­ecules in a distorted octa­hedral geometry. The carb­oxy group links with the carboxyl­ate group of the same ligand via an intra­molecular O—H⋯O hydrogen bond. An extensive inter­molecular N—H⋯O and O—H⋯O hydrogen-bonded network exists in the crystal structure. One disordered lattice water mol­ecule is half-occupied and is located close to an inversion center.