ethyl 3,6-dioxoheptanoate

methyl 2-(6,6-dimethyl-5-oxabicyclo[2.1.1]hexan-4-yl)acetate

methyl 2-(3-acetyloxy-2,2-dimethylcyclopentylidene)acetate

6,6-二甲氧基-2-甲基庚-2-烯

3-(羟基甲基)-6-甲基庚-5-烯-2-酮