Synonyms: 1,3-Naphthalenedisulfonic acid, 6,6'-((3,3'-dimethoxy(1,1'-biphenyl)-4,4'-diyl)bis(2,1-diazenediyl))bis(4-amino-5-hydroxy-;1,3-Naphthalenedisulfonic acid, 6,6'-((3,3'-dimethoxy(1,1'-biphenyl)-4,4'-diyl)bis(azo))bis(4-amino-5-hydroxy-;6,6'-((3,3'-Dimethoxy(1,1'-biphenyl)-4,4'-diyl)bis(azo))bis(4-amino-5-hydroxynaphthalene-1,3-disulphonic) acid;(6Z)-4-amino-6-({4'-[(2E)-2-(8-amino-1-oxo-5,7-disulfonaphthalen-2(1H)-ylidene)hydrazino]-3,3'-dimethoxybiphenyl-4-yl}hydrazono)-5-oxo-5,6-dihydronaphthalene-1,3-disulfonic acid