ethyl 2,4-dioxoheptadecanoate

5,6-dimethyl-1,4-dioxane-2,3-dione

diethyl 2-(3,4-dimethoxyphenyl)propanedioate

(1,2-diethoxy-2-trimethylsilyloxyethenoxy)-trimethylsilane

1,4-dihydrothieno[3,4-b]pyrazine-2,3-dione