2,7-Naphthalenedisulfonic acid, 3,3'-((3,3'-dimethoxy(1,1'-biphenyl)-4,4'-diyl)bis(azo))bis(5-amino-4-hydroxy-, sodium salt 2429-74-5 3,3'-((3,3'-Dimethoxy(1,1'-biphenyl)-4,4'-diyl)diazo)bis(5-amino-4-hydroxynaphthalene-2,7-disulphonic) acid, sodium salt 68966-50-7 EINECS 273-439-0