1-Ethyl-1,4-dihydro-4-oxo-6,7-difluoro-3-quinolinecarboxylicacid; 1-Ethyl-6,7-difluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid;6,7-Difluoro-1-ethyl-4-oxo-1,4-dihydroquinoline-3-carboxylic acid
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