6359-74-6 98249-02-6 Benzenesulfonic acid, 4-((4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo)-, sodium salt EINECS 228-805-4 Sodium p-((4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo)benzenesulphonate