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In the title mol­ecule, C 16 H 13 Cl 2 FN 2 OS, the dihedral angle between the thio­phene and benzene rings is 80.34 (12)°. The pyrazoline ring is in an envelope conformation, and the plane through the four coplanar atoms makes dihedral angles of 85.13 (9) and 6.89 (10)° with the thio­phene and benzene rings, respectively. The C and O atoms of the acetyl group are nearly coplanar with the attached pyrazoline ring. In the crystal structure, inversion dimers arise from pairs of inter­molecular C—H⋯O hydrogen bonds. A short inter­molecular Cl⋯S contact of 3.4250 (13) Å is also found.

1-[3-(2,4-Dichloro-5-fluorophenyl)-5-(3-methyl-2-thienyl)-4,5-dihydro-1H-pyrazol-1-yl]ethanone