| Summary: | In the molecular structure of the title compound, C21H15N3O4, 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.
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