Synonyms: tetrasodium 4,4'-[(3,3'-dichloro[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[3-aminonaphthalene-2,7-disulphonate];Diphenyl Red 8B;CIDIRECTRED46;DIRECTRED46;2,7-Naphthalenedisulfonic acid, 4,4'-[(3,3'-dichloro[1,1'- biphenyl]-4,4'-diyl)bis(azo)]bis[3-amino-, tetrasodium salt;4,4'-[(3,3'-Dichloro-1,1'-biphenyl-4,4'-diyl)bis(azo)]bis[3-amino-2,7-naphthalenedisulfonic acid]tetrasodium salt;C.I.23050;2,7-Naphthalenedisulfonic acid, 4,4'-((3,3'-dichloro(1,1'-biphenyl)-4,4'-diyl)bis(2,1-diazenediyl))bis(3-amino-, sodium salt (1:4)