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The title compound, C 14 H 12 N 2 O 4 , is a Schiff base that exists in the keto-enamine tautomeric form and adopts a Z configuration. The mol-ecule is almost planar, the rings making a dihedral angle of 4.99 (7)°. The mol-ecular structure is stabilized by an intra-molecular N-H⋯O hydrogen bond forming an S (6) ring motif. In the crystal, inversion-related mol-ecules are linked by pairs of O-H⋯O hydrogen bonds, forming dimers with an R  2  2 (18) ring motif. The dimers are linked by pairs of C-H⋯O contacts with an R  2  2 (10) ring motif, forming ribbons extended along the [20] direction. Hirshfeld surface analysis, two-dimensional fingerprint plots and the mol-ecular electrostatic potential surfaces were used to analyse the inter-molecular inter-actions present in the crystal, indicating that the most important contributions for the crystal packing are from H⋯H (33.9%), O⋯H/H⋯O (29.8%) and C⋯H/H⋯C (17.3%) inter-actions.

Crystal structure and Hirshfeld surface analysis of (Z)-6-[(2-hydroxy-5-nitroanilino)methylidene]-4-methylcyclohexa-2,4-dien-1-one