5H-Thiazolo(3,2-a)quinoline-4-carboxylic acid, 7-fluoro-5-oxo-8-(1-piperazinyl)- 7-Fluoro-5-oxo-8-(1-piperazinyl)-5H-thiazolo(3,2-a)quinoline-4-carboxylic acid 84338-99-8