EINECS 285-155-4, 2,7-Naphthalenedisulfonic acid,3-hydroxy-4-(2-(4-((4-(2-(2-hydroxy-6-sulfo-1-naphthalenyl)diazenyl)-2-methylphenyl)methyl)-3-methylphenyl)diazenyl)-,sodium salt (1:?), 2,7-Naphthalenedisulfonic acid,3-hydroxy-4-((4-((4-((2-hydroxy-6-sulfo-1-naphthalenyl)azo)-2-methylphenyl)methyl)-3-methylphenyl)azo)-,sodium salt