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In the title salt hydrate, C 2 H 10 N 2   2+ ·C 12 H 10 N 2 O 6   2− ·4H 2 O, each of the ions is located about a centre of inversion and the asymmetric unit is completed by two water molecules in general positons. In the crystal, the cations, anions and water mol­ecules are connected by O—H⋯O and N—H⋯O hydrogen bonding into a three-dimensional network.

Ethane-1,2-diaminium 2,2′-[terephthaloylbis(azanediyl)]diacetate tetrahydrate