1-tritylpyrrole-2,5-dione

1-(pyridin-4-ylmethyl)pyrrole-2,5-dione

1-hexadecylpyrrole-2,5-dione

3-(丁基氨基)-2,5-吡咯烷二酮

ethyl 2-(2,5-dioxopyrrol-1-yl)acetate