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
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