4-((1-Hydroxy-6-((((5-hydroxy-6-((2-methoxyphenyl)azo)-7-sulpho-2-naphthyl)amino)carbonyl)amino)-3-sulpho-2-naphthyl)azo)naphthalene-1-sulphonic acid, sodium salt 83221-78-7 EINECS 280-258-0