2-[(5-benzoyl-2,3-dihydro-1H-pyrrolizine-1-carbonyl)oxymethyl]-1-cyclopropyl-6-fluoro-8-methoxy-7-(3-methylpiperazin-1-yl)-4-oxoquinoline-3-carboxylic acid;2-[[2-[1-(4-chlorobenzoyl)-5-methoxy-2-methylindol-3-yl]acetyl]oxymethyl]-1-cyclopropyl-6-fluoro-8-methoxy-7-(3-methylpiperazin-1-yl)-4-oxoquinoline-3-carboxylic acid;3-[2-(3-fluoro-4-phenylphenyl)propanoyloxy]propyl 1-cyclopropyl-6-fluoro-8-methoxy-7-[3-methyl-4-[(5-methyl-2-oxo-1,3-dioxol-4-yl)methyl]piperazin-1-yl]-4-oxoquinoline-3-carboxylate