2,3,6,6-tetramethyl-5,7-dihydro-1H-indol-4-one

5',5',6,6-tetramethylspiro[5,7-dihydro-1,3-benzoxaselenole-2,2'-cyclohexane]-1',3',4-trione

3,3-dimethyl-2,4-dihydroacridin-1-one

2-[1-(4,4-dimethyl-2,6-dioxocyclohexyl)heptyl]-5,5-dimethylcyclohexane-1,3-dione

2-(dimethylaminomethylidene)-5,5-dimethylcyclohexane-1,3-dione