67875-24-5 Benzenesulfonic acid, 3-((4-aminophenyl)azo)-4-chloro-, monosodium salt Benzenesulfonic acid, 3-((p-aminophenyl)azo)-4-chloro-, sodium salt EINECS 267-539-3 Sodium 3-((4-aminophenyl)azo)-4-chlorobenzenesulphonate