6371-84-2 Benzenesulfonic acid, 4-((3-((2,4-dimethylphenyl)azo)-2,4-dihydroxyphenyl)azo)-, monosodium salt EINECS 228-900-0 Sodium 4-((3-((2,4-dimethylphenyl)azo)-2,4-dihydroxyphenyl)azo)benzenesulphonate