Ethane-1,2-diaminium bis­(4-carb­oxy-2-propyl-1H-imidazole-5-carb­oxy­ate) monohydrate

In the title hydrated molecular salt, C(2)H(10)N(2) (2+)·2C(8)H(9)N(2)O(4) (−)·H(2)O, an intra­molecular O—H⋯O hydrogen bond occurs in the anion, forming an S(7) ring. The –CO(2) and –CO(2)H groups make dihedral angles of 3.2 (2) and 2.0 (3)°, respectively, with the five-membered ring. In the crystal, N—H⋯O, N—H⋯N and O—H⋯O hydrogen bonds lead to the formation of a three-dimensional supra­molecular architecture. The methyl group in the anion is disordered over two sets of sites in a 0.716 (9):0.284 (9) ratio. The ethylenediamine cation is generated by symmetry and the water molecule lies on a twofold axis.