3'-Fluoro-[1,1':4',1''-terphenyl]-2',3'',5'',6'-tetracarboxylic acid
5,5-(1,3,5,7-tetraoxopyrrolo(3,4-f)isoindole-2,6-diyl)diisophthalic acid
1,3-Benzenedicarboxylic acid, 5,5'-[2,2'-bipyridine]-5,5'-diylbis-
4,4',4",4"'-(Pyrene-1,3,6,8-tetrayl)tetrakis(3-aminobenzoic acid)
9H-Carbazole-3,6-dicarboxylic acid, 9-(3,5-dicarboxyphenyl)-