Synonyms:
1,1'-[1,2-phenylenebis(methylene)]bis[2-(2-sulfonatoethyl)pyridinium] ; pyridinium,1,1'-[1,2-phenylenebis(methylene)]bis[2-(2-sulfoethyl)-, dihydroxide, bis(innersalt) ; 1,1'-[1,2-phenylenebis(methylene)]bis[2-(2-sulphonatoethyl)pyridinium] ; pyridinium,1,1'-[1,2-phenylenebis(methylene)]bis[2-(2-sulfoethyl)-, bis(inner salt) (9ci)