37672-83-6 Barium bis(p-(4,5-dihydro-3-methyl-5-oxo-4-(phenylazo)-1H-pyrazol-1-yl)benzenesulphonate) Benzenesulfonic acid, 4-(4,5-dihydro-3-methyl-5-oxo-4-(phenylazo)-1H-pyrazol-1-yl)-, barium salt EINECS 253-588-8