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In the title Schiff base compound, C12H15N3O2, obtained from a condensation reaction of cyclohexanone and 2-nitrophenylhydrazine, the phenylhydrazone group is planar, the largest deviation from the mean plane being 0.0252 (12) Å, and the nitro fragment is twisted slightly with respect to the mean plane, making a dihedral angle of 6.96 (17)°. The cycloheaxanone ring displays a chair conformation. An intramolecular N—H...O hydrogen bond helps to stabilize the molecular structure.