2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-((7-sulfo-1-naphthalenyl)azo)-, sodium salt 7-Amino-4-hydroxy-3-((7-sulfo-1-naphthalenyl)azo)-2-naphthalenesulfonic acid, sodium salt 7-Amino-4-hydroxy-3-((7-sulpho-1-naphthyl)azo)naphthalene-2-sulphonic acid, sodium salt 75627-21-3 EINECS 278-275-3