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A series of newly disubstituted (compounds 4a,b) and trisubstituted 1,3,4-thiadiazines 5a-l with various substituents was prepared utilizing different thiosemicarbazides and 3-α-bromoacetylcoumarins as starting compounds. The structures of the synthesized 1,3,4-thiadiazines are elucidated and confirmed utilizing the corresponding analytical and spectroscopic data. All of the new thiadiazine derivatives were tested for their antioxidant activity, employing different antioxidant assays (DPPHdoi:10.3390/molecules19011163 pmid:24445343 fatcat:ihzmujpwzjbtzikl5dppgk2tjq