Synonyms: 2-Naphthalenesulfonic acid, 7,7'-(carbonyldiimino)bis(4-hydroxy-3-(2-(6-sulfo-2-naphthalenyl)diazenyl)-, sodium salt, compd. with 2,2',2''-nitrilotris(ethanol) (1:?:?);2-Naphthalenesulfonic acid, 7,7'-ureylenebis(4-hydroxy-3-((6-sulfo-2-naphthyl)azo)-, sodium triethanolamine salts (1:x:x);2-Naphthalenesulfonic acid, 7,7'-(carbonyldiimino)bis(4-hydroxy-3-((6-sulfo-2-naphthalenyl)azo)-, sodium salt, compd. with 2,2',2''-nitrilotris(ethanol);7,7'-(Carbonyldiimino)bis(4-hydroxy-3-((6-sulpho-2-naphthyl)azo)naphthalene-2-sulphonic) acid, sodium salt, compound with 2,2',2''-nitrilotriethanol