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In the title compound, C 10 H 10 N 4 O 4 , the two imidazole rings adopt a  trans  conformation and are inclined to one another at a dihedral angle of 55.64 (4)°. In the crystal structure, mol­ecules are linked by inter­molecular O—H⋯N hydrogen bonds into chains running parallel to [010] and layers are formed from these by inter­molecular C—H⋯O hydrogen bonds. Additional C—H⋯O hydrogen bonds produce a three-dimensional network.

2,2′-(2,2′-Biimidazole-1,1′-diyl)diethanoic acid