The title compound, C7H6BrN3O, was obtained from the reaction of 6-bromo-1H-imidazo[4,5-b]pyridin-2(3H)-one with methyl iodide. All non-H atoms lie in a common plane [r.m.s deviation = 0.017 (1) Å]. The amino group is a hydrogen-bond donor to the carbonyl group of an inversion-related molecule, the pair of hydrogen bonds giving rise to a hydrogen-bonded dimer.
The imidazopyridine ring system in the title compound, C9H8BrN3S, is almost planar [r.m.s. deviation of the C and N atoms = 0.007 (1) Å]. The S and methylene C atoms connected to the five-membered ring lie within this plane. The remaining two methylene groups of the thiazine ring are disordered over two sets of sites in a 0.817 (5):0.183 (5) ratio.
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