2,2'':7'',2''''-Ter (9,9'-spirobi[fluorene])

C1(C2(C3=C(C4=C2C=CC=C4)C=CC=C3)C5=C6C=CC=C5)=C6C=CC(C7=CC(C8(C9=C(C%10=C8C=CC=C%10)C=CC=C9)C%11=C%12C=CC(C%13=CC(C%14(C%15=C(C%16=C%14C=CC=C%16)C=CC=C%15)C%17=C%18C=CC=C%17)=C%18C=C%13)=C%11)=C%12C=C7)=C1