Synonyms: 7,7'-(Carbonyldiimino)bis(4-hydroxy-3-((2-methyl-4-sulphophenyl)azo)naphthalene-2-sulphonic) acid, sodium salt, compound with 2,2'-(methylimino)diethanol;2-Naphthalenesulfonic acid, 7,7'-(carbonyldiimino)bis(4-hydroxy-3-((2-methyl-4-sulfophenyl)azo)-, sodium salt, compd. with 2,2'-(methylimino)bis(ethanol)