ethyl 4-methyl-5-oxo-1,2-dihydropyrazole-3-carboxylate

ethyl 6-ethoxy-3-methyl-4-oxo-1H-quinoline-2-carboxylate

乙基2-(3-羟基-2-喹喔啉基)丙酸酯

diethyl 2,2-dimethyl-3-oxobutanedioate

ethyl 2,4-dimethyl-3-oxo-1H-pyrazole-5-carboxylate