ethyl 2-[(5-ethoxycarbonyl-4-methyl-1,3-thiazol-2-yl)disulfanyl]-4-methyl-1,3-thiazole-5-carboxylate

ethyl 7-chloro-3-methyl-4H-1,4-benzothiazine-2-carboxylate

ethyl 2-(1H-benzimidazol-2-ylsulfanyl)-3-oxobutanoate