ethyl 5,6,8-trimethyl-2-oxo-8-((trimethylsilyl)oxy)bicyclo[4.2.0]octane-7-carboxylate

ethyl 1,2,8-trimethyl-5-oxo-8-((trimethylsilyl)oxy)bicyclo[4.2.0]octane-7-carboxylate

3,4-二甲基茴香醚

7,8-dimethyl-1,4-dioxa-spiro[4.5]dec-6-ene

3-亚甲基-2,6-庚烷二酮