9,9'-Spirobi[9H-fluorene]-2,2',7,7'-tetramine,N,N,N',N',N'',N'',N''',N'''-octaphenyl- (9CI);2,2',7,7'-Tetrakis(diphenylamino)-9,9'-spirobifluorene;2,2',7,7'-Tetrakis-(N,N-diphenylamino)-spiro-9,9'-bifluorene; S-TAD; Spiro-TAD
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