1821-20-1
(3E)-3-[乙氧基(羟基)甲亚基]-2H-色烯-2,4(3H)-二酮
→
~95%
213181-26-1
ethyl 4-chloro-2-oxochromene-3-carboxylate
5538-51-2
邻乙酰水杨酰氯
105-53-3
丙二酸二乙酯