Acta Cryst. (2007). E63, o3962 [ doi:10.1107/S1600536807042481 ]
Abstract: Molecules of the title compound, C4H4ClN3, are essentially planar. N-HN hydrogen bonds link the molecules into a two-dimensional network parallel to the (100) plane. The pyridazine rings of inversion-related molecules are stacked with their centroids separated by a distance of 3.7597 (10) Å, indicating - interactions.
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