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The 2-oxo analogs of thiazolo[4,5- d ]pyrimidine-2-thiones were prepared to study their cytotoxic activity. Five of the newly synthesized compounds were selected by the National Cancer Institute (Bethesda, MD, USA) for a primary in vitro antitumor assay. 7-Chloro-3,5-diphenyl-thiazolo[4,5- d ]pyrimidin-2-one ( 5a ) proved to be the most active one among the screened derivatives and was further evaluated in the full panel of 60 cell lines at five different concentrations. The structures of compounds were determined by IR, 1 H-NMR, 13 C-NMR, X-ray, and elemental analysis.

Synthesis and anticancer evaluation of novel 3,5-diaryl-thiazolo[4,5-d]pyrimidin-2-one derivatives