3-((4-((2-Ethoxy-5-methylphenyl)azo)-1-naphthyl)azo)benzenesulphonic acid 52695-54-2 74082-20-5 Benzenesulfonic acid, 3-((4-((2-ethoxy-5-methylphenyl)azo)-1-naphthalenyl)azo)- EINECS 258-109-6