33935-64-7
methyl 2-bromomethylbut-2-enoate
+
141-97-9
乙酰乙酸乙酯
→
88039-62-7
1-ethyl 5-methyl 2-acetyl-3-methyl-4-methylenepentanedioate
88039-54-7
1-O-ethyl 5-O-methyl 2-acetyl-4-ethylidenepentanedioate