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The title mol­ecule, C9H7BrN4OS, is essentially planar [r.m.s. deviation = 0.066 (2) Å], the maximum deviation from the mean plane through the non-H atoms being 0.190 (3) Å for the terminal amine N atom. In the crystal, mol­ecules are linked through N—H...O and N—H...S inter­actions, generating infinite chains along the b-axis direction. In turn, the chains are stacked along the a axis via π–π inter­actions [centroid–centroid distance = 3.470 (2) Å] and further connected by N—H...Br inter­actions into a three-dimensional network. An intra­molecular N—H...O hydrogen bond is also observed.
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