3-Quinolinecarboxylic acid, 1,4-dihydro-4-oxo-, ethyl ester;3-Quinolinecarboxylic acid, 4-hydroxy-, ethyl ester;Ethyl 4-hydroxyquinoline-3-carboxylate;Ethyl 4-oxo-1,4-dihydroquinoline-3-carboxylate
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