2-ethyl-2-methyl-1,3-dioxane-4,6-dione

2-phenyl-1,3-dioxane-4,6-dione

2-(4-fluorophenyl)-1,3-dioxane-4,6-dione

1,5-二氧杂螺[5.5]十一烷-2,4-二酮

N-乙基哌啶