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In the title salt, C 4 H 14 N 2+ ·2C 9 H 3 Cl 4 O 4− , the cation lies on an inversion center. In the anion, the mean planes of meth­oxy­carbonyl and carboxyl­ate groups form dihedral angles of 64.9 (3) and 58.5 (3)°, respectively, with the benzene ring. In the crystal, inter­molecular N—H⋯O hydrogen bonds connect the components into sheets parallel to (100).

Butane-1,4-diaminium bis[3,4,5,6-tetrachloro-2-(methoxycarbonyl)benzoate]