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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\u2005(19) and 11.23\u2005(19)\u00b0, respectively. In the crystal, the molecules are linked by pairs of N\u2014H...O bonds into centrosymmetric dimers and by C\u2014H...\u03c0 contacts into columns. 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