7-fluoro-8-(1-piperazinyl)-5-oxo-5H-thiazolo<3,2-a>quinoline-4-carboxylic acid
7-fluoro-8-(4-methyl-1-piperazinyl)-5-oxo-5H-thiazolo<3,2-a>quinoline-4-carboxylic acid
7-fluoro-1-methyl-5-oxo-8-(1-piperazinyl)-5H-thiazolo<3,2-a>quinoline-4-carboxylic acid
7-fluoro-1-methyl-8-(4-methyl-1-piperazinyl)-5-oxo-5H-thiazolo<3,2-a>quinoline-4-carboxylic acid