2-Methoxy-5-methyl-4-((4-sulfophenyl)azo)benzeneamine 40947-69-1 Benzenesulfonic acid, 4-((4-amino-5-methoxy-2-methylphenyl)azo)- EINECS 255-151-7 p-((4-Amino-5-methoxy-o-tolyl)azo)benzenesulphonic acid