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In the mol-ecule of the title compound, C(17)H(20)N(2)O(2), the aromatic rings are oriented at a dihedral angle of 6.23 (22)°. Intra-molecular N-H⋯O hydrogen bonding involving the amine H atom and the carbonyl O atom affects the conformation of the mol-ecule. One of the ethyl arms is disordered over two conformations, with occupancies of 0.59 (2) and 0.41 (2). The crystal packing is stabilized by inter-molecular C-H⋯O and O-H⋯O hydrogen bonds, and weak C-H⋯π inter-actions.

3-Diethylamino-6-[(Z)-(4-hydroxyanilino)methylidene]cyclohexa-2,4-dienone