9-(dibromomethylidene)fluorene

2,7-dimethylacridine

10,10-dibromodispiro[2.0.5⁴.1³]decane

1,1-dibromo-2-propylcyclopropane

1',1'-dibromospiro[1,5-dihydro-2,4-benzodioxepine-3,2'-cyclopropane]