134653-70-6
2-Dimethylaminomethylen-acetessigsaeureethylester
→
~97%
87698-53-1
ethyl 2-(hydroxymethylidene)-3-oxobutanoate
3788-94-1
2-乙氧亚甲基乙酰乙酸乙酯
141-97-9
乙酰乙酸乙酯