2,7-Naphthalenedisulfonic acid, 4-amino-6-((2,5-dimethoxy-4-((2-(sulfooxy)ethyl)sulfonyl)phenyl)azo)-5-hydroxy-3-((4-((2-(sulfooxy)ethyl)sulfonyl)phenyl)azo)-, tetrasodium salt 84229-70-9 EINECS 282-468-8 Tetrasodium 4-amino-6-((2,5-dimethoxy-4-((2-(sulphonatooxy)ethyl)sulphonyl)phenyl)azo)-5-hydroxy-3-((4-((2-(sulphonatooxy)ethyl)sulphonyl)phenyl)azo)naphthalene-2,7-disulphonate