5',5'''-Bis(4-carboxyphenyl)-2'',5''-dimethoxy-[1,1':3',1'':4'',1''':3''',1''''-quinquephenyl]-4,4''''-dicarboxylic acid

5',5'''-Bis(4-carboxyphenyl)-2'',5''-dimethoxy-[1,1':3',1'':4'',1''':3''',1''''-quinquephenyl]-4,4''''-dicarboxylic acid,