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In the title compound, C 13 H 10 N 4 O 5 ·0.5C 2 H 5 OH, the two benzene rings form a dihedral angle of 4.29 (9)°. The ethanol solvent mol­ecule was treated as disordered between two orientations related by symmetry (center of inversion), with occupancies fixed at 0.5. The crystal packing, stabilized by inter­molecular O—H⋯O and N—H⋯O hydrogen bonds and π–π inter­actions [indicated by the short distance of 3.7299 (7) Å between the centroids of benzene rings from neighbouring mol­ecules], exhibits short inter­molecular O⋯O contacts of 2.8226 (3) Å.

4-{[2-(2,4-Dinitrophenyl)hydrazinylidene]methyl}phenol ethanol hemisolvate