Crystal structure and Hirshfeld surface analysis of a Schiff base: ()-6-[(5-chloro-2-meth-oxy-anilino)methyl-idene]-2-hy-droxy-cyclo-hexa-2,4-dien-1-one.

The title compound, CHClNO, is a Schiff base that exists in the keto-enamine tautomeric form and adopts a configuration. In the crystal, the dihedral angle between the planes of the benzene rings is 5.34 (15)°. The roughly planar geometry of the mol-ecule is stabilized by a strong intra-molecular N-H⋯O hydrogen bond. In the crystal, pairs of centrosymmetrically related mol-ecules are linked by O-H⋯O hydrogen bonds, forming (10) rings. Besides this, the mol-ecules form stacks along the [001] direction with C-H⋯π and C-H⋯Cl contacts between the stacks. The inter-molecular inter-actions in the crystal were analysed using Hirshfeld surfaces. The most significant contribution to the crystal packing is from H⋯H contacts (30.8%).