4-[3-(Trifluoro-meth-yl)phen-yl]-5,6,7,8-tetra-hydro-cinnolin-3(2H)-one.

The title compound, C15H13F3N2O, contains one benzene ring, one cyclo­hexane ring and a pyridazine ring. The dihedral angle formed by the pyridazine ring with the benzene ring is 61.5 (2)°. The crystal structure is stabilized by two inter­molecular hydrogen bonds (N—H⋯O and C—H⋯F). The cyclohexane ring adopts a screw-boat conformation. The CF3 group is disordered over two positions; the site occupancy factors are ca 0.6 and 0.4.