1,5-Naphthalenedisulfonic acid, 3,3-(2,2-disulfo1,1-biphenyl-4,4-diyl)bisimino(6-chloro-1,3,5-triazine-4,2-diyl)imino(1-hydroxy-3-sulfo-6,2-naphthalenediyl)azobis-, octasodium salt | 3,3'-[(2,2'-Disulfo[1,1'-biphenyl]-4,4'-diyl)bis[imino(6-chloro-1,3,5-triazine-4,2-diyl)imino(1-hydroxy-3-sulfo-6,2-naphthalenediyl)-2,1-diazenediyl]]bis-1,5-naphthalenedisulfonic acid sodium salt |