2-Naphthalenesulfonic acid, 6-(methylamino)-5-((2-sulfo-4-((2-(sulfooxy)ethyl)sulfonyl)phenyl)azo)- 2-Naphthalenesulfonic acid, 6-methylamino-5-((2-sulfo-4-((2-(sulfooxy)ethyl)sulfonyl)phenyl)azo)- 6-(Methylamino)-5-((2-sulpho-4-((2-(sulphooxy)ethyl)sulphonyl)phenyl)azo)naphthalene-2-sulphonic acid 67846-60-0 EINECS 267-374-7