Levofloxacin N-Oxide

(-)-(S)-9-Fluoro-2,3-dihydro-3-methyl-10-(4-methyl-1-piperazinyl)-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic acid N-oxide ;|Levofl-2,3-dihydromethyl-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazin)-10-yl]piperazine 1-oxide