3-Quinolinecarboxylic acid, 1,4-dihydro-1-cyclopropyl-6-fluoro-4-oxo-7-(1-piperazinyl)-, 5-oxotetrahydro-2-furancarboxylate (1:1) Ciprofloxacin 5-oxotetrahydrofuran-2-carboxylate VB1994600