6,7-Difluoro-1-methyl-4-oxo-4H-2-th; ia-8b-aza-cyclobuta[a]naphthalene-3; -carboxylic acid ethyl ester;1H,4H-[1,3]Thiazeto[3,2-a]quinoline-3-carboxylicacid, 6,7-difluoro-1-methyl-4-oxo-, ethyl ester;
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