2,3-dimethylbut-2-ene-1,4-diol

3,4-dimethyl-1-phenylpyrrole-2,5-dione

4-(2,3-二甲基马来酰亚胺基)马尿酸

3,4-dimethyl-1-(4-methylphenyl)pyrrole-2,5-dione

1-(4-methoxyphenyl)-3,4-dimethylpyrrole-2,5-dione