1-ethyl-4-oxo-6-[3-({2-[(phenylmethyl)oxy]ethyl}oxy)-1-propyn-1-yl]-1,4-dihydro-3-quinolinecarboxylic acid

1-ethyl-6-{3-[(2-hydroxyethyl)oxy]propyl}-4-oxo-1,4-dihydro-3-quinolinecarboxylic acid

6-[3-({2-[(2-cyanoethyl)oxy]ethyl}oxy)propyl]-1-ethyl-4-oxo-1,4-dihydro-3-quinolinecarboxylic acid

6-[3-({2-[(2-carboxyethyl)oxy]ethyl}oxy)propyl]-1-ethyl-4-oxo-1,4-dihydro-3-quinolinecarboxylic acid

1-cyclopropyl-6-iodo-4-oxo-1,4-dihydro-3-quinolinecarboxylic acid