4-Piperidinecarboxylic acid, 1,1',1''-(1,3,5-triazine-2,4,6-triyl)tris-
1,3-Benzenedicarboxylic acid, 5-[bis[(4-carboxyphenyl)methyl]amino]-
5'-(2-carboxyphenyl)-[1,1':3',1''-terphenyl]-2,2''-dicarboxylicacid
4′,6′-Bis(4-carboxyphenyl)[2,2′-bipyridine]-5- carboxylic acid
4'',4''''',4''''''''-Nitrilotris(([1,1':4',1''-terphenyl]-4-carboxylic acid))