1,5‐Dimethyl‐2‐phenyl‐4‐(4,4,4‐trifluoro‐3‐oxo‐1‐phenylbut‐1‐enylamino)‐1H‐pyrazol‐3(2H)‐one

In the title compound, C21H18F3N3O2, the pyrazole ring is approximately planar and forms dihedral angles of 47.61 (9) and 69.39 (8)° with the two phenyl rings. An intramolecular N—H...O hydrogen bond stabilizes the molecular conformation. Intermolecular N—H...O hydrogen bonds link the molecules into centrosymmetric dimers. The trifluoromethyl group is disordered over two positions in a ratio of ∼0.8:0.2.