(2-Amino-7-methyl-4-oxidopteridine-6-carboxyl­ato-κ³O⁴,N⁵,O⁶)(ethane-1,2-diamine-κ²N,N′)(1H-imidazole-κN³)nickel(II) dihydrate

In the title complex, [Ni(C₈H₅N₅O₃)(C₂H₈N₂)(C₃N₂H₄)]·2H₂O, a tridentate 2-amino-7-methyl-4-oxidopteridine-6-carboxyl­ate (pterin) ligand, a bidentate ancillary ethane-1,2-diamine (en) ligand and a monodentate 1H-imidazole (im) ligand complete a distorted octa­hedral geometry around the Ni^II atom. The pterin ligand forms two chelate rings. Both the en and im ligands are arranged nearly orthogonally relative to the pterin ligand [dihedral angles between the mean planes of the en and pterin ligands and of the im and pterin ligands are 84.62 (9) and 85.14 (9)°, respectively]. N—H...N, N—H...O, O—H...N and O—H...O hydrogen bonds link the complex mol­ecules and lattice water mol­ecules into a three-dimensional network.