3-((4-((7-Amino-1-hydroxy-3-sulpho-2-naphthyl)azo)-1-naphthyl)azo)salicylic acid, sodium salt 83221-54-9 Benzoic acid, 3-((4-((7-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo)-1-naphthalenyl)azo)-2-hydroxy-, sodium salt EINECS 280-232-9