1,4-Dihydro-4-oxo-3-quinolinecarboxylic Acid Ethyl Ester

3-Ethoxycarbonyl-4(1H)-quinolone; 4-Oxo-1,4-dihydroquinoline-3-carboxylic acid ethyl ester; Ethyl 1,4-dihydro-4-oxoquinoline-3-carboxylate; Ethyl 4-oxo-1,4-dihydroquinoline-3-carboxylate;