Synonyms: 2,7-Naphthalenedisulfonic acid, 3,3'-((3,3'-dimethoxy(1,1'-biphenyl)-4,4'-diyl)bis(2,1-diazenediyl))bis(5-amino-4-hydroxy-, sodium salt, compd. with 2,2'-iminobis(ethanol) (1:?:?);2,7-Naphthalenedisulfonic acid, 3,3'-((3,3'-dimethoxy(1,1'-biphenyl)-4,4'-diyl)bis(azo))bis(5-amino-4-hydroxy-, sodium salt, compd. with 2,2'-iminobis(ethanol);3,3'-((3,3'-Dimethoxy(1,1'-biphenyl)-4,4'-diyl)diazo)bis(5-amino-4-hydroxynaphthalene-2,7-disulphonic) acid, sodium salt, compound with 2,2'-iminodiethanol;sodium (3Z)-5-amino-3-(2-{4'-[(2Z)-2-(8-amino-1-oxo-3,6-disulfonaphthalen-2(1H)-ylidene)hydrazinyl]-3,3'-dimethoxybiphenyl-4-yl}hydrazinylidene)-4-oxo-7-sulfo-3,4-dihydronaphthalene-2-sulfonate - 2,2'-iminodiethanol (1:1:1)