1,3,3-triphenylspiro[azetidine-4,9'-fluorene]-2-one

3',4',4'-triphenylfluorene-9-spiro-2'-oxazolidin-5'-one

9,9'-dicyano-9,9'-bifluorene

1-氧化二苯基二氮烯

N-(fluoren-9-ylideneamino)aniline