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Crystal structure of 2-ethyl-4-methyl-1-(2-oxido-3,4-dioxocyclobut-1-en-1-yl)-1H-imidazol-3-ium
(Int Union Crystallography, 2016)
In the title inner salt molecule, C10H10N2O3, the four-membered cyclobutene ring is twisted by 7.1 (2)degrees with respect to the five-membered imidazole ring. The crystal packing exhibits an R-2(2)(9) hydrogen-bonding ...