spiro-fluorenylcyclohexane

3',4'-dichloro-1',6'-dicyanospironorcarene>-2',5'-dione

6,6-dimethyldibenzofulvene oxide

spiro[aceanthrylene-2(6H),9'-[9H]fluorene]-6-one

2,3-dichlorospiro[cyclopropane-1,9'-fluorene]