Acta Cryst. (2002). E58, o1081-o1082 [ doi:10.1107/S1600536802015933 ]
Abstract: In the title compound, C7H4ClNO4·C4H4N2, the two components are connected by an O-HN hydrogen bond. C-HO hydrogen bonds connect the C7H4ClNO4·C4H4N2 units to afford a macrocycle with graph-set descriptor R44(16); this ring is located on an inversion center.
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