2-Hydroxy-3-((2-hydroxydibenzofuran-1-yl)azo)-5-nitrobenzenesulfonic acid, monosodium salt 6232-51-5 Benzenesulfonic acid, 2-hydroxy-3-((2-hydroxy-1-dibenzofuranyl)azo)-5-nitro-, monosodium salt EINECS 228-337-0 Sodium 2-hydroxy-3-((2-hydroxy-1-dibenzofuryl)azo)-5-nitrobenzenesulphonate