Norfloxacin - 1-ethyl-6-fluoro-4-oxo-7-(piperazin-1-yl)-1,4-dihydroquinoline-3-carboxylic acid ; 1-Ethyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinolinecarboxylic Acid;
Norfloxacin EP Impurity - K - 6-Fluoro-1,4-dihydro-1-methyl-4-oxo-7-(1-piperazinyl)-3-quinolinecarboxylic Acid; Norfloxacin Related Compound K;6-fluoro-1-methyl-4-oxo-7-(piperazin-1-yl)-1,4-dihydroquinoline-3-carboxylic acid;