6,6'-[vinylenebis[(3-sulpho-p-phenylene)azo]]bis[4-amino-5-hydroxynaphthalene-1,3-disulphonic] acid, sodium salt

6,6'-[vinylenebis[(3-sulpho-p-phenylene)azo]]bis[4-amino-5-hydroxynaphthalene-1,3-disulphonic] acid, sodium salt

6,6'-[1,2-Ethenediylbis[(3-sulfo-4,1-phenylene)azo]]bis(4-amino-5-hydroxy-1,3-naphthalenedisulfonic acid)/sodium,(1:x) salt;6,6'-[Vinylenebis[(3-sulfo-p-phenylene)azo]]bis[4-amino-5-hydroxynaphthalene-1,3-disulfonic] acid, sodium salt;6,6'-[vinylenebis[(3-sulpho-p-phenylene)azo]]bis[4-amino-5-hydroxynaphthalene-1,3-disulphonic] acid, sodium salt