2,7-Naphthalenedisulfonic acid, 4-hydroxy-5-((4-((4-((2-hydroxyethyl)amino)-6-((5-hydroxy-6-((2-methoxy-5-sulfophenyl)azo)-7-sulfo-2-naphthalenyl)amino)-1,3,5-triazin-2-yl)amino)-5-methoxy-2-methylphenyl)azo)-, tetrasodium salt 73398-51-3 EINECS 277-449-6