Synonyms: 2-Naphthalenesulfonic acid, 7,7'-(carbonyldiimino)bis(4-hydroxy-3-((6-sulfo-2-naphthalenyl)azo)-, compd. with 2,2',2''-(nitrilotris(2,1-ethanediyloxy))tris(ethanol) (1:3);2-Naphthalenesulfonic acid, 7,7'-(carbonyldiimino)bis(4-hydroxy-3-(2-(6-sulfo-2-naphthalenyl)diazenyl)-, compd. with 2,2',2''-(nitrilotris(2,1-ethanediyloxy))tris(ethanol) (1:3);7,7'-(Carbonyldiimino)bis(4-hydroxy-3-((6-sulpho-2-naphthyl)azo)naphthalene-2-sulphonic) acid, compound with 2,2',2''-(nitrilotris(ethyleneoxy))triethanol (1:3);6-[(2E)-2-{1-oxo-6-[({(6E)-5-oxo-7-sulfo-6-[2-(6-sulfonaphthalen-2-yl)hydrazinylidene]-5,6-dihydronaphthalen-2-yl}carbamoyl)amino]-3-sulfonaphthalen-2(1H)-ylidene}hydrazinyl]naphthalene-2-sulfonic acid - 2,2',2''-[nitrilotris(ethane-2,1-diyloxy)]triethanol (1:3)