5-(3,5-dicarboxybenzoylamino)isophthalic acid
5'-((3,5-dicarboxyphenyl)ethynyl)-[1,1':3',1''-terphenyl]-4,4''-dicarboxylic acid
5',5''''-(1,4-phenylenebis(ethyne-2,1-diyl))bis(([1,1':3',1''-terphenyl]-4,4''-dicarboxylic acid))