1,5-Di­methyl-4-{[(E)-3-oxo-3-(2-thienyl)-1-(tri­fluoro­methyl)-1-propenyl]­amino}-2-phenyl-1,2-di­hydro-3H-pyrazol-3-one

In the title compound, C₁₉H₁₆F₃N₃O₂S, the side-chain carbonyl group, the adjacent double bond and the amine N atom are essentially coplanar, with the largest deviation from the mean plane being 0.010 (2) Å. A strong intramolecular N—H⋯O hydrogen bond [N⋯O 2.702 (3) Å and N—H⋯O 139 (3)°] is observed, leading to an en­amine tautomer in the solid state.