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The title compound, C7H8N6O, represents the keto form and adopts a nearly planar structure (r.m.s. deviation of the non-H atoms = 0.072 Å). In the crystal, mol­ecules form spiral chains along the c axis by N—H...N hydrogen bonds. The chains are linked to each other by weak C—H...O hydrogen bonds, forming a three-dimensional framework.
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