Moxifloxacin Hydrochloride Imp. C (EP): 1-Cyclopropyl-8-ethoxy-6-fluoro-1,4-dihydro-7-(4aS,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl]-4-oxo-1,4-dihydroquinoline-3-carboxylic acid.