2-丁炔酸

9,10-dioxa-anti-(methyl,methyl)(methy,bromo)bimane

2,6-dibromo-1,5-dimethylpyrazolo[1,2-a]pyrazole-3,7-dione

2,3,5,6-四甲基-1H,7H-吡唑并[1,2-a]吡唑-1,7-二酮

2,3,6,7-四甲基-1,5-二氮杂双环[3.3.0]-2,6-辛二烯-4,8-二酮