1,5-diethyl-3-methyl-5-phenyl-1,3-diazinane-2,4,6-trione

5-乙氧基-2-甲基吡啶

ethyl 1-ethyl-2-oxocyclohexane-1-carboxylate

7-乙基-4-氧代-4,7-二氢噻吩并[2,3-b]吡啶-5-羧酸