Crystal structure and Hirshfeld surface analysis of 6-((E)-2-{4-[2-(4-chloro­phen­yl)-2-oxoeth­oxy]phen­yl}ethen­yl)-4,5-di­hydro­pyridazin-3(2H)-one

The pyridazine ring in the title compound, C20H17ClN2O3, adopts a screw-boat conformation. The whole mol­ecule is flattened, the dihedral angles subtended by the least-squares plane of the central aromatic ring with those of the terminal benzene and pyridazine rings being 15.18 (19) and 11.23 (19)°, respectively. In the crystal, the mol­ecules are linked by pairs of N—H⋯O bonds into centrosymmetric dimers and by C—H⋯π contacts into columns. The results of the Hirshfeld surface analysis show that the most prominent inter­actions are H⋯H, accounting for 36.5% of overall crystal packing, and H⋯O/O⋯H (18.6% contribution) contacts.