A crystallographic twofold rotation axis passes through the C-C bond joining the imidazole rings of the title compound, C10H10N4O2. the molecule crystallizes in a cis disposition. the planar acetyl group is twisted by 5.0 (3)° with respect to the imidazole ring and the two imidazole rings are tilted by 60.53 (5)° in relation to one another.
P. M. Secondo et al., "1,1′-diacetyl-2,2′-biimidazole," Acta Crystallographica Section C: Crystal Structure Communications, Wiley-Blackwell, Jan 1996.
The definitive version is available at http://dx.doi.org/10.1107/S0108270196008001
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