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A series of novel 3-aryl-6-(1,1-biphenyl-4-yl)-7H-1,2,4-triazolo[3,4-b][1,3,4 ]thiadiazines was synthesized by means of the reactions between 3-aryl-4-amino-5-mercapto-1,2,4-triazoles and 2-bromo-4-phenylacetophenone. The structures of all the title com