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In the mol­ecular structure of the title compound, C 21 H 15 N 3 O 4 , the inter­planar angle between the benzoyl units is 89.7 (1)°. The corresponding angles between the phenyl­hydrazono and the benzoyl groups are 31.4 (3) and 60.8 (2)°, respectively. In the crystal, a strong resonance-assisted intra­molecular hydrogen bond (N—H⋯O) and a weak intra­molecular hydrogen bond (C—H⋯N) strongly affect the observed conformation of the mol­ecule. The crystal packing is determined by a strong inter­molecular hydrogen bond (N—H⋯O), giving rise to a helical chain along the  a  axis. In addition, two weak inter­molecular contacts (C—H⋯O) are observed.

2-[2-(4-Nitrophenyl)hydrazinylidene]-1,3-diphenylpropane-1,3-dione