Acta Cryst. (2002). E58, o1182-o1184  [ doi:10.1107/S1600536802017348 ]

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

M. Yu, J.-L. Wang and F.-M. Miao

Abstract: 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-HO hydrogen bond [NO 2.702  (3)  Å and N-HO 139  (3)°] is observed, leading to an enamine tautomer in the solid state.

Online 5 October 2002

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