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The asymmetric unit of the title compound, C17H12ClF3N4O2S, contains two molecules, which differ in their planarity and hydrogen bonding. In one molecule, the 2-oxoindolin (C8/N/O A), thiosemicarbazide (N3/C/S B) and 5-chloro-2-methylphenyl (C7/Cl C) units are planar with r.m.s. deviations of 0.0110, 0.0173 and 0.0259 Å, respectively. The dihedral angles A/B, B/C and A/C are 1.74 (15), 40.70 (13) and 41.00 (11)°, respectively. In the other molecule the deviations are 0.0455, 0.0007 and 0.0143 Å, respectively, and the dihedral angles are 5.01 (14), 4.53 (16) and 3.38 (13)°, respectively. In both molecules, intramolecular N—H...N and N—H...O hydrogen bonds form S(5) and S(6) ring motifs, respectively and C—H...S interactions occur. In one of the molecules, an intramolecular C—H...F interaction is also present. In the crystal, the molecules are linked by N—H...O, C—H...F, C—H...O and N—H...S hydrogen bonding, forming a polymeric network.