ethyl 2-(5-chloro-1H-indol-3-yl)-2-oxoacetate

ethyl 2-(3-methylanilino)-2-oxoacetate

ethyl 7-bromo-[1,2,4]triazolo[1,5-a]pyridine-2-carboxylate

2-氰基-3-氧代-丁二酸 1,4-二乙基酯

ethyl 2-oxo-4-phenylbut-3-ynoate