title: (E)-4-[(4-Diethyl-amino-2-hy-droxy-benzyl-idene)amino]-benzoic acid.
abstract: In the title compound, C(18)H(20)N(2)O(3), a potential bidentate N,O-donor Schiff base ligand, the benzene rings are inclined at an angle of 12.25 (19)°. The mol-ecule has an E conformation about the C=N bond. One of the ethyl groups is disordered over two positions, with a refined site-occupancy ratio of 0.55 (1):0.45 (1). An intra-molecular O-H⋯N hydrogen bond makes an S(6) ring motif. In the crystal, pairs of O-H⋯O hydrogen bonds link mol-ecules, forming inversion dimers with R(2) (2)(8) ring motifs.
authors.forename: Hadi
authors.initials: H
authors.lastname: Kargar
authors.forename: Zahra
authors.initials: Z
authors.lastname: Sharafi
authors.forename: Reza
authors.initials: R
authors.lastname: Kia
authors.forename: Muhammad Nawaz
authors.initials: MN
authors.lastname: Tahir