[1,1':4',1'':3'',1''':3''',1'''':4'''',1'''''-Sexiphenyl]-4,4'''''-dicarboxaldehyde, 5'',5'''-bis(4'-formyl[1,1'-biphenyl]-4-yl)-2'',2''',4'',4''',6'',6'''-hexamethyl-

5",5"'-bis(4'-formyl-[1,1'-biphenyl]-4-yl)-2",2"',4",4"',6",6"'-hexamethyl-[1,1':4',1":3",1"':3"',1"":4"",1""'-sexiphenyl]-4,4""'-dicarbaldehyde