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The title mol­ecule, C 16 H 15 I 2 N 3 O 2 , adopts an  E  configuration about the C=N bond. The dihedral angle between the two benzene rings is 6.4 (2)°. An intra­molecular O—H⋯N hydrogen bond occurs. In the crystal, mol­ecules are linked through inter­molecular N—H⋯O hydrogen bonds, forming chains propagating in the  c -axis direction.

4-Dimethylamino-N′-(2-hydroxy-3,5-diiodobenzylidene)benzohydrazide