2,7-Naphthalenedisulfonic acid, 3,3'-((3,3'-dimethoxy(1,1'-biphenyl)-4,4'-diyl)bis(azo))bis(4,5-dihydroxy-, tetrasodium salt 3,3'-((3,3'-Dimethoxy(1,1'-biphenyl)-4,4'-diyl)bis(azo))bis(4,5-dihydroxy-2,7-naphthalenedisulfonic acid), tetrasodium salt 4198-19-0 C.I. DIRECT BLUE 10 CCRIS 6141 EINECS 224-091-3 Tetrasodium 3,3'-((3,3'-dimethoxy(1,1'-biphenyl)-4,4'-diyl)bis(azo))bis(4,5-dihydroxynaphthalene-2,7-disulphonate)