Synonyms: 3,3'-(Vinylenebis((3-sulpho-p-phenylene)azo))bis(5-amino-4-hydroxynaphthalene-2,7-disulphonic) acid, potassium salt, compound with 2,2',2''-nitrilotriethanol;2,7-Naphthalenedisulfonic acid, 3,3'-(1,2-ethenediylbis((3-sulfo-4,1-phenylene)azo))bis(5-amino-4-hydroxy-, potassium salt, compd. with 2,2',2''-nitrilotris(ethanol)