Synonyms: 2,7-Naphthalenedisulfonic acid, 3,3'-(1,2-ethenediylbis((3-sulfo-4,1-phenylene)-2,1-diazenediyl))bis(5-amino-4-hydroxy-, compd. with 2,2',2''-nitrilotris(ethanol) (1:6);4,4'-Bis((8-amino-1-hydroxy-3,6-disulfo-2-naphthyl)azo)-2,2'-stilbenedisulfonic acid, triethanolamine salt (1:6);2,7-Naphthalenedisulfonic acid, 3,3'-(1,2-ethenediylbis((3-sulfo-4,1-phenylene)azo))bis(5-amino-4-hydroxy-, compd. with 2,2',2''-nitrilotris(ethanol) (1:6);3,3'-(Ethylenebis((3-sulpho-p-phenylene)azo))bis(5-amino-4-hydroxynaphthalene-2,7-disulphonic) acid, compound with 2,2',2''-nitrilotriethanol (1:6)