The title compound, C19
NO, has an E
conformation about the N=C bond. The molecule is relatively planar, with the benzene ring and naphthalene ring plane being inclined to one another by 4.28 (10)°. There is an intramolecular O-H
N hydrogen bond generating an S
(6) ring motif. In the crystal, molecules are linked via
O hydrogen bonds, forming chains propagating along . Within the chains there are
interactions involving the benzene ring and the naphthalene ring system of an adjacent molecule [inter-centroid distance = 3.6405 (14) Å].