Synonyms: 2-Naphthalenesulfonic acid, 7,7'-(carbonyldiimino)bis(4-hydroxy-3-(2-(2-methyl-4-sulfophenyl)diazenyl)-, compd. with 2,2',2''-nitrilotris(ethanol) (1:4);2-Naphthalenesulfonic acid, 7,7'-(carbonyldiimino)bis(4-hydroxy-3-((2-methyl-4-sulfophenyl)azo)-, compd. with 2,2',2''-nitrilotris(ethanol) (1:4);7,7'-(Carbonyldiimino)bis(4-hydroxy-3-((2-methyl-4-sulphophenyl)azo)naphthalene-2-sulphonic) acid, compound with 2,2',2''-nitrilotriethanol (1:4);(3E)-3-[2-(2-methyl-4-sulfophenyl)hydrazinylidene]-7-[({(6E)-6-[2-(2-methyl-4-sulfophenyl)hydrazinylidene]-5-oxo-7-sulfo-5,6-dihydronaphthalen-2-yl}carbamoyl)amino]-4-oxo-3,4-dihydronaphthalene-2-sulfonic acid - 2,2',2''-nitrilotriethanol (1:4)