2-Quinolinecarboxylic acid, 1,4-dihydro-4-oxo-, methyl ester;2-Quinolinecarboxylic acid, 4-hydroxy-, methyl ester;Methyl 4-hydroxyquinoline-2-carboxylate;Methyl 4-oxo-1,4-dihydroquinoline-2-carboxylate
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