6-(2-ethyloxycarbonylamino-ethyl)-1-ethyl-4-oxo-1,4-dihydro-quinolin-3-carboxylic acid ethyl ester

2'-O-acetyl-4''-O-{2-[3-(3-carboxy-1,4-dihydro-1-ethyl-4-oxo-6-quinolinyl)prop-2-enyl]-oxyethyl}-azithromycin 11,12-carbonate ethyl ester

6-(2-carbamoyl-ethyl)-1-ethyl-4-oxo-1,4-dihydro-quinolone-3-carboxylic acid ethyl ester

6-(2-amino-ethyl)-1-ethyl-4-oxo-1,4-dihydroquinoline-3-carboxylic acid ethyl ester hydroiodide salt

1-ethyl-4-oxo-6-piperazin-1-yl-1,4-dihydro-quinoline-3-carboxylic acid