2-((6-Amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo)benzoic acid 2-((6-Amino-1-hydroxy-3-sulpho-2-naphthyl)azo)benzoic acid 68133-35-7 Benzoic acid, 2-((6-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo)- EINECS 268-678-2