5,5'-(2-methylpyrimidine-4,6-diyl)diisophthalic acid
4',4'''-(3,5-dimethylpyridine-2,6-diyl)bis([1,1'-biphenyl]-4-carboxylic acid)
[3,4'-Bipyridine]-5-carboxylic acid
5-(4-Carboxyphenyl)nicotinic acid
5-(Imidazol-1-ylmethyl)isophthalic acid