Cyclohexane-1,2,3,4,5,6-hexacarboxylic acid
[1,1'-Biphenyl]-2,2',4,4',6,6'-hexacarboxylic acid
[1,1':4',1''-Terphenyl]-2',3,3'',5,5',5''-hexacarboxylic acid
(3S,7S,14R,23S,27S)-5,13,17,25-Tetraoxo-14-(2-oxo-1-(4,7,10-tris(carboxymethyl)-1,4,7,10-tetraazacyclododecan-1-yl)-6,9,12,15-tetraoxa-3-azaoctadecanamido)-4,6,12,18,24,26-hexaazanonacosane-1,3,7,23,27,29-hexacarboxylic acid
Dipyrazino[2,3-f:2',3'-h]quinoxaline-2,3,6,7,10,11-hexacarboxylic acid
