6,6-二甲基-5-亚甲基-1,3-环戊二烯

6,6-Dimethylfulven-2,3-dicarbonsaeure-dimethylester

5,5-dimethyl-3-methylidenepyrrolidin-2-one

3-(4-nitrophenyl)-6-oxo-8,8-dimethyl-1-oxa-2,7-diazaspiro<4.4>non-2-ene

3,6-bis(4-nitrophenyl)-1,4,2,5-dioxadiazine