(E)-1-{2-Hy-droxy-5-[(4-methyl-phen-yl)diazen-yl]phen-yl}ethanone.

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 mol-ecular conformation is stabilized by a strong intra-molecular O-H⋯O hydrogen bond. In the crystal, inter-molecular C-H⋯O hydrogen bonds occur.