Diethyl 4-hydroxy-2,6-pyridinedicarboxylate

4-oxo-1-phenylpyridine-2,6-dicarboxylic acid

二氢-2H-吡喃-4(3h)-酮 肟

1-乙基-4-氧代-吡啶-2,6-二甲酸

1-phenylpyridin-4-one