65212-77-3 Benzenesulfonic acid, 4,5-dichloro-2-((4,5-dihydro-3-methyl-5-oxo-1-(3-sulfophenyl)-1H-pyrazol-4-yl)azo)-, calcium salt (1:1) Calcium 4,5-dichloro-2-((4,5-dihydro-3-methyl-5-oxo-1-(3-sulphonatophenyl)-1H-pyrazol-4-yl)azo)benzenesulphonate EINECS 265-634-4