4-fluoren-9-ylidene-2,6-dimethylcyclohexa-2,5-dien-1-one

9-methylsulfanyl-9H-fluorene

benzyl-(9H-fluoren-9-yl)-dimethylazanium

N,N-dimethyl-9H,9'H-[9,9'-bifluoren]-9-amine

1-(9H-fluoren-9-yl)-2-methylpyridin-1-ium,bromide