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A novel series of 2-(3-(4-oxo-2-substituted phenyl thiazolidin-3-yl)phenyl)benzo[d]thiazole-6-carboxylic acid derivatives PP1–PP8 were synthesized by various benzothiazole Schiff’s bases by reaction with thioglycollic acid. Their structures were established on the basis of IR, ¹H-NMR, ¹³C-NMR, mass spectral data and elemental analysis. All the synthesized compounds were screened for their in vitro anticancer activity by 3-(4,5-dimethyl thiazole-2yl)-2,5-diphenyltetrazoliumbromide (MTT) assay on human cervical cancer cell line (HeLa) cell lines. Among these compound PP2 exhibited most significant activity as compared with PP5, PP7 and PP8. However, the activity was less as compared to the standard drug Cisplatin.