2,7-Naphthalenedisulfonic acid, 4-hydroxy-3-((4-((2-(sulfooxy)ethyl)sulfonyl)phenyl)azo)-, potassium sodium salt 2,7-Naphthalenedisulfonic acid, 4-hydroxy-3-((4-((2-(sulfoxy)ethyl)sulfonyl)phenyl)azo)-, potassium sodium salt 4-Hydroxy-3-((4-((2-(sulphooxy)ethyl)sulphonyl)phenyl)azo)naphthalene-2,7-disulphonic acid, potassium sodium salt 85940-65-4 EINECS 288-953-0