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The title compound 4-(5-(2,6-difluorophenyl)-1,3,4-oxadiazol-2-ylthio)-2-(trifluoromethyl)thieno[2,3-d]pyrimidine(C15H5F5N4OS2, Mr = 416.35) was designed and synthesized as antitumor agent, and its structure was determined by 1H NMR, 13C NMR, MS, elementa