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The title compound, C16H14ClN3O2S, crystallizes with two molecules in the asymmetric unit. In the 1,3-thiazolidine rings, the carbonyl O atoms, the S atoms, the methyl groups and the ring carbon attached to the methyl groups are disordered with occupancy ratios of 0.509 (7):0.491 (7) in one molecule and 0.464 (14):0.536 (14) in the other. The crystal structure is stabilized by intermolecular N-H...N, C-H...O hydrogen bonds and C-H...Cl interactions. In addition, there is a pi-pi stacking interaction [centroid-centroid distance = 3.794 (3) A] between the benzene and pyridine rings.