organic compounds
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In the title adduct, C7H5NO4·0.5C6H6N4, the complete biimidazole molecule is generated by a crystallographic inversion centre. In the crystal, N—HO and O—HN hydrogen bonds connects the 4-nitrobenzoic acid and 2,2′-biimidazole units, affording multi-dimensional frameworks with graph-set descriptor R22(9).