2,7-Naphthalenedisulfonic acid, 3-((4-(2-(4-((8-(acetylamino)-1-hydroxy-3,6-disulfo-2-naphthalenyl)azo)-2-sulfophenyl)ethenyl)-3-sulfophenyl)azo)-5-amino-4-hydroxy-6-((4-sulfophenyl)azo)-, heptasodium salt 85118-36-1 EINECS 285-690-3