9,10-dioxa-syn-(methyl,phenyl)bimane

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

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

bis(9,10-dioxa-syn-(methyl,methyleno)(methyl,methyl)bimane)

9,10-dioxa-syn-(methyl,methyleno)(methyl,methyl)bimane-9,10-dioxa-anti-(methyl,methyleno)(methyl,methyl)bimane