Synonyms: 1-Cyclopropyl-1,4-dihydro-6,7-difluoro-4-oxoquinoline-3-carboxylicacid; 1-Cyclopropyl-6,7-difluoro-1,4-dihydro-4-oxoquinoline-3-carboxylic acid;1-Cyclopropyl-6,7-difluoro-4-oxo-1,4-dihydroquinolin-3-carboxylic acid;1-Cyclopropyl-6,7-difluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid; X 3