7-benzoyl-2,2-dimethyl-4H-1,4-benzoxazin-3-one

ethyl 2,3-dimethylbut-2-enoate

3-羟基-2,2-二甲基丁酸

7-ethoxy-6,6-dimethyl-5,7-dioxoheptanoate

6-ethoxy-5,5-dimethyl-4,6-dioxohexanoate