67939-05-3 Benzenesulfonic acid, 4-((2,4-dihydroxy-3-((4-methylphenyl)azo)phenyl)azo)-, monosodium salt Benzenesulfonic acid, 4-((3-((4-methylphenyl)azo)-2,4-dihydroxyphenyl)azo)-, monosodium salt EINECS 267-823-7 Sodium 4-((2,4-dihydroxy-3-((4-m-tolyl)azo)phenyl)azo)benzenesulphonate