1,5-Naphthalenedisulfonic acid, 3-((4-((4-((3-(((4-((4,8-disulfo-2-naphthalenyl)azo)-2-methoxy-5-methylphenyl)amino)carbonyl)-4-methoxyphenyl)azo)benzoyl)amino)-5-methoxy-2-methylphenyl)azo)-, tetrapotassium salt 25746-43-4 EINECS 247-231-5