Synonyms: 3,3'-(Vinylenebis((3-sulpho-p-phenylene)azo))bis(6-amino-4-hydroxynaphthalene-2-sulphonic) acid, potassium salt, compound with 2,2',2''-nitrilotriethanol;2-Naphthalenesulfonic acid, 3,3'-(1,2-ethenediylbis((3-sulfo-4,1-phenylene)azo))bis(6-amino-4-hydroxy-, potassium salt, compd. with 2,2',2''-nitrilotris(ethanol)