tetralithium 3,3'-[(3,3'-dimethoxy[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[5-amino-4-hydroxynaphthalene-2,7-disulphonate]

3,3'-[(3,3'-Dimethoxy-1,1'-biphenyl-4,4'-diyl)bisazo]bis(5-amino-4-hydroxy-2,7-naphthalenedisulfonic acid dilithium) salt

2,7-Naphthalenedisulfonic acid, 3,3'-[(3,3'-dimethoxy[1,1'- biphenyl]-4,4'-diyl)bis(azo)]bis[5-amino-4-hydroxy -, tetralithium salt