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Bifluorenylidene Difluorenylidene Tetrabenzfulvalene Diphenyleneethylene Bis[fluorenylidene] Dibiphenyleneethene delta9,9'-Bifluorene Dibiphenyleneethylene 9,9'-BIFLUORENYLIDENE Δ9,9'-Bi[9H-fluorene] 9,9'-Difluorenylidene tetrabenzo[5.5]fulvalene 9,9'-Bifluorenylidene &gt 9-fluoren-9-ylidenefluorene 9,9'-FLUORENYLIDENEFLUORENE 1,2-Bis(biphenylene)ethylene 9-(9H-Fluoren-9-ylidene)-9H-fluorene 9H-Fluorene, 9-(9H-fluoren-9-ylidene)- Deltadimethyl9dimethyl,dimethyl9'-bifluorene