6232-55-9 Benzenesulfonic acid, 3-((4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo)-2-hydroxy-5-methyl-, monosodium salt EINECS 228-339-1 Sodium 5-((4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo)-4-hydroxytoluene-3-sulphonate