(S)-9-Fluoro-2,3-dihydro-3-methyl-7-oxo-10-(1-piperazinyl)-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic acid, DN 5455, Desmethyl Levofloxacin, UING 4-255, Levofloxacin Related Compound A (USP), Levofloxacin Related Compound A, Levofloxacin Hemihydrat