141-97-9
乙酰乙酸乙酯
→
10226-28-5
5,6-二氢-3-乙氧羰基-2-甲基-4H-吡喃
+
14749-45-2
ethyl 2-acetyl-5-chloropentanoate
109-70-6
1-溴-3-氯丙烷