for the following products
6-Fluoro-1-methyl-4-oxo-7-(1-piperazinyl)-4H-(1,3)thiazeto(3,2-a)quinoline-3-carboylic acid ethyl ester | Ethyl 6-fluoro-1-methyl-4-oxo-7-(1-piprazinyl)-4H-[1,3]thiazeto[3,2-a]quinoline-3-carboxylate and 6-Fluoro-1-methyl-4-oxo-7-(1-piperazinyl)-1H,4H-[1,3]-thiazeto[3,2-a]-3-quinolinecarboxylic acid ethyl ester
