Levofloxacin Impurity A Catalogue Y536341 CAS 2254176-11-7 M.W 383.80 M.F C17H18FN3O4.HCl Specifications FAQs (S)-9-fluoro-3-methyl-7-oxo-10-(piperazin-1-yl)-3,7-dihydro-2H -[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic acid hydrochlorideCAS:free base:117707-40-1