2-{2-[4-(4-Fluoro-phen-yl)piperazin-1-yl]-2-oxoeth-yl}-6-(morpholin-4-yl)-4-phenyl-pyridazin-3(2H)-one.

In the title compound, C(26)H(28)FN(5)O(3), the morpholine ring adopts a chair conformation. The piperazine ring is puckered [Q(T) = 0.5437 (15) Å, θ = 8.89 (15) and ϕ = 357.2 (11)°]. The 1,6-dihydro-pyridazine ring makes dihedral angles of 28.03 (7) and 77.46 (7)° with the phenyl and benzene rings, respectively. In the crystal, mol-ecules are linked along the c axis by C-H⋯O inter-actions and are flattened parallel to the ac plane. C-H⋯π inter-actions also contribute to the stability of the structure.