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