2,7-Dibromospiro[fluorene-9,9'-xanthene]
1-(2,7-Dibromospiro[fluorene-9,4'-piperidin]-1'-yl)ethanone
2',7'-Dibromospiro[fluorene-9,9'-xanthene]
2',7'-Dibromospiro[adamantane-2,9'-fluorene]
2',7'-Dibromospiro[benzo[c]fluorene-7,9'-fluorene]
