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In the title compound, C26H28FN5O3, the morpholine ring adopts a chair conformation. The piperazine ring is puckered [Q(T) = 0.5437 (15) angstrom, theta = 8.89 (15) and phi = 357.2 (11)degrees]. The 1,6-dihydropyridazine ring makes dihedral angles of 28.03 (7) and 77.46 (7)degrees with the phenyl and benzene rings, respectively. In the crystal, molecules are linked along the c axis by C-H center dot center dot center dot O interactions and are flattened parallel to the ac plane. C-H center dot center dot center dot pi interactions also contribute to the stability of the structure.