2,2-二甲基-5-(2-hexahydroazepinylidene)-1,3-dioxan-4,6-dione

6-ethyl-2,2-dimethyl-1,3-dioxin-4-one

2,2-二甲基-5-异亚丙基-1,3-二噁烷-4,6-二酮

2,2-dimethyl-5-(3'-phenyl-2',3'-dihydro-1'H-inden-1'-ylidene)-1,3-dioxan-4,6-dione