1,2-Dihydro-4-hydroxy-1-methyl-2-oxo-3-quinolinecarboxylic acid ethyl ester 3-Quinolinecarboxylic acid, 1,2-dihydro-4-hydroxy-1-methyl-2-oxo-, ethyl ester 5-22-07-00362 (Beilstein Handbook Reference) 57513-54-9 BRN 0484263 Ethyl 1,2-dihydro-4-hydroxy-1-methyl-2-oxo-3-quinolinecarboxylate