1,4-Dihydro-6-chloro-1-ethyl-4-oxo-7-(1-piperazinyl)-3-quinolinecarboxylic acid 3-Quinolinecarboxylic acid, 1,4-dihydro-6-chloro-1-ethyl-4-oxo-7-(1-piperazinyl)- 6-Chloro-1-ethyl-1,4-dihydro-4-oxo-7-(1-piperazinyl)quinoline-3-carboxylic acid 67681-84-9