D9,9'-Bifluorene (6CI,8CI);9,9'-Bifluorenylidene; 9,9'-Bis(fluorenylidene); 9,9'-Difluorenylidene;Bisfluorenylidene; Diphenyleneethylene; NSC 12425; NSC 16079;Tetrabenzfulvalene; Tetrabenzofulvalene
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