4-[(2-Hydroxy-1-naphthyl)methylideneamino]benzoic acid

The molecule of the title compound, C18H13NO3, is almost planar, the dihedral angle between the naphthalene and benzene ring systems being 4.04 (6)°. The molecular conformation and packing are stabilized by intramolecular O—H...N and intermolecular O—H...O and C—H...O interactions.