6,6'-[(3,3'-dimethoxy[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[4-amino-5-hydroxynaphthalene-1,3-disulphonic] acid 2,2'-(3,3'-Dimethoxy-1,1'-biphenyl-4,4'-diylbisazo)bis(8-amino-1-hydroxynaphthalene-5,7-disulfonic acid) 6,6'-[(3,3'-Dimethoxy[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[4-amino-5-hydroxy-1,3-naphthalenedisulfonic acid] 6,6'-[(3,3'-Dimethoxy-4,4'-biphenylylene)bisazo]bis(4-amino-5-hydroxynaphthalene-1,3-disulfonic acid) 6,6'-[[3,3'-Dimethoxy[1,1'-biphenyl]-4,4'-diyl]bis(azo)]bis[4-amino-5-hydroxy-1,3-naphthalenedisulfonic acid] Sky Blue FF 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-