540474-65-5 6359-97-3 Benzenesulfonic acid, 2,5-dichloro-4-(4,5-dihydro-3-methyl-5-oxo-4-(phenylazo)-1H-pyrazol-1-yl)-, sodium salt C.I. ACID YELLOW 34, MONOSODIUM SALT EINECS 228-818-5 Sodium 2,5-dichloro-4-(4,5-dihydro-3-methyl-5-oxo-4-(phenylazo)-1H-pyrazol-1-yl)benzenesulphonate