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The mol­ecule of the title compound, C9H9N5O, is approximately planar (the r.m.s. deviation of all non-H atoms is 0.08 Å). The amine substituent is pyramidal at the N atom. An intra­molecular N—Hhydrazine...O=C hydrogen bond is present. In the crystal, mol­ecules are connected via N—H...N and N—H...O hydrogen bonds, forming infinite layers parallel to (010). This polymorph is triclinic, space group P-1, whereas the previously reported form was monoclinic, space group P21/c [Elgemeie et al. (2013). Acta Cryst. E69, o187], with stepped layers and a significantly lower density.
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