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The title compound, C 14 H 10 BrN 3 O 4 , was synthesized by the reaction of 4-hydr­oxy-3-nitro­benzaldehyde with an equimolar quantity of 3-bromo­benzohydrazide in methanol. The mol­ecule displays an  E  configuration about the C=N bond. The dihedral angle between the two benzene rings is 4.6 (2)°. The nitro group is almost coplanar with the attached benzene ring [dihedral angle = 4.7 (2)°]. In the crystal structure, mol­ecules are linked into sheets parallel to (100) by inter­molecular N—H⋯O, O—H⋯N and O—H⋯O hydrogen bonds.

(E)-3-Bromo-N′-(4-hydroxy-3-nitrobenzylidene)benzohydrazide