(Methanetetrayltetrakis(benzene-4,1-diyl))tetrakis(phosphonic acid)
[2,2'-Bipyridine]-5,5'-dicarbonyl dichloride
Tetrasodium-meso-tetra(4-sulfonatophenyl)porphine
3-Aminonaphthalene-1,5-disulfonic acid hydrate
