English alias:N-([1,1'-biphenyl]-4-yl)-N-(9,9-dimethyl-9H-fluoren-2-yl)-9,9'-spirobi[fluoren]-2-amine;N-[4-biphenyl]-N-(9,9-dimethyl fluoren-2-yl)-9,9'-spirobi[fluoren]-2-amine;9,9'-Spirobi[9H-fluoren]-2-amine, N-[1,1'-biphenyl]-4-yl-N-(9,9-dimethyl-9H-fluoren-2-yl)-;N-[1,1′-Biphenyl]-4-yl-N-(9,9-dimethyl-9H-fluoren-2-yl)-9,9′-spirobi[9H-fluoren]-2-amine