5',5''-Bis(4-carboxyphenyl)-2',2'',4',4'',6',6''-hexamethyl-[1,1':3',1'':3'',1'''-quaterphenyl]-4,4'''-dicarboxylic acid

5',5''-Bis(4-carboxyphenyl)-2',2'',4',4'',6',6''-hexamethyl-[1,1':3',1'':3'',1'''-quaterphenyl]-4,4'''-dicarboxylic acid