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Biphenyl-4-yl-(9,9-dimethyl-9H-fluoren-2-yl)-(9,9‘-spirobifluoren-4-yl)-amine N-([1,1'-Biphenyl]-4-yl)-N-(9,9-dimethyl-9H-fluoren-2-yl)-9,9'-spirobi[fluoren]-4-amine N-([1,1'-Biphenyl]-4-yl)-N-(9,9-dimethyl-9H-fluoren-2-yl)-9,9'-spirobi[fluoren]-4-amine N-[1,1′-Biphenyl]-4-yl-N-(9,9-dimethyl-9H-fluoren-2-yl)-9,9′-spirobi[9H-fluoren]-4-amine 9,9'-Spirobi[9H-fluoren]-4-amine, N-[1,1'-biphenyl]-4-yl-N-(9,9-dimethyl-9H-fluoren-2-yl)-