spiro[fluorene-9,3'-oxolane]-2',5'-dione

9-(2-phenylphenyl)fluoren-9-ol

Fluorenonthiosemicarbazon-9

9-(7-bicyclo[4.1.0]hepta-1,3,5-trienylidene)fluorene

9-[bis(4-methylphenyl)methylidene]fluorene