3-[[2-Methyl-4-[[4-[2-[4-[[3-methyl-4-[(5,8-disulfo-2-naphthalenyl)azo]phenyl]azo]-2-sulfophenyl]ethenyl]-3-sulfophenyl]-onn-azoxy]phenyl]azo]-1,5-naphthalenedisulfonic acid hexasodium salt
3-[[2-Methyl-4-[[4-[2-[4-[[3-methyl-4-[(5,8-disulfo-2-naphthalenyl)azo]phenyl]azo]-2-sulfophenyl]ethenyl]-3-sulfophenyl]-onn-azoxy]phenyl]azo]-1,5-naphthalenedisulfonic acid hexasodium salt