4-((4-((4-Hydroxyphenyl)azo)-5-methoxy-2-methylphenyl)azo)benzenesulfonic acid, sodium salt 68400-34-0 Benzenesulfonic acid, 4-((4-((4-hydroxyphenyl)azo)-5-methoxy-2-methylphenyl)azo)-, monosodium salt EINECS 270-023-0 Sodium ((4-((4-hydroxyphenyl)azo)-5-methoxy-2-methylphenyl)azo)-4-benzenesulphonate