141-97-9
乙酰乙酸乙酯
+
95-92-1
乙二酸二乙酯
→
15849-14-6
cyclopentane-1,2,4-trione
488-86-8
巴豆酸
62966-17-0
(4-methoxy-2-oxocyclopent-3-en-1-yl) acetate