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The mol­ecule of the title compound, C 9 H 9 N 5 O, is essentially planar (r.m.s. deviation of all atoms = 0.02 Å) except for the NH 2  H atoms. An intra­molecular hydrazinyl­idene–carbonyl N—H⋯O=C hydrogen bond is present. In the crystal, mol­ecules are connected  via  N—H⋯N/O hydrogen bonds, forming thick layers parallel to (100).

(E)-3-Amino-4-(2-phenylhydrazinylidene)-1H-pyrazol-5(4H)-one