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The structure of the title compound, C 15 H 14 N 2 O 2 , an azo dye, displays a  trans  configuration with respect to the N=N bridge. The dihedral angle between the aromatic rings is 5.06 (8)°. The mol­ecular conformation is stabilized by a strong intra­molecular O—H⋯O hydrogen bond. In the crystal, inter­molecular C—H⋯O hydrogen bonds occur.

(E)-1-{2-Hydroxy-5-[(4-methylphenyl)diazenyl]phenyl}ethanone