Ciprofloxacin Hydrochloride - Impurity B (Freebase)

1-Cyclopropyl-4-oxo-7-(piperazin-1-yl)-1,4-dihydroquinoline-3-carboxylic acid (Desfluoro Compound);
1-Cyclopropyl-7-piperazinyl-1,4-dihydro-4-oxoquinoline-3-carboxylic Acid; 1-Cyclopropyl-4-oxo-7-(piperazin-1-yl)-1,4-dihydroquinoline-3-carboxylic Acid; 1-Cyclopropyl-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinolinecarboxylic Acid; 1,4-Dihydroquinoline-3-carboxylic Acid, 1-Cyclopropyl-4-oxo-7-(piperazin-1-yl)-; Desfluorociprofloxacin; 1-Cyclopropyl-4-oxo-7-(piperazin-1-yl)-1,4-dihydroquinoline-3-carboxylic Acid (USP);