Acta Cryst. (2011). E67, o2467 [ doi:10.1107/S1600536811034192 ]
Abstract: The nine-membered fused-ring system of the title pyridazine derivative, C7H7N3OS, is almost planar (r.m.s. deviation 0.012 Å). In the crystal, the amino H atom forms a hydrogen bond to the ketonic O atom of a neighboring molecule to generate a centrosymmetric dimer.
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