2,7-Naphthalenedisulfonic acid, 3,3'-((3,3'-dimethoxy(1,1'-biphenyl)-4,4'-diyl)bis(azo))bis(5-(acetylamino)-4-hydroxy-, tetrasodium salt 3,3'-((3,3'-Dimethoxy-(1,1-biphenyl)-4,4'-diyl)bis(azo))bis(5-(acetylamino)-4-hydroxy-2,7-naphthalenedisulfonic acid), tetrasodium salt 67906-44-9 EINECS 267-711-8 Tetrasodium 3,3'-((3,3'-dimethoxy(1,1'-biphenyl)-4,4'-diyl)bis(azo))bis(5-(acetylamino)-4-hydroxynaphthalene-2,7-disulphonate)