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4-[4-[(2-Nitro-4-sulfophenyl)azo]-3-methyl-5-oxo-2-pyrazolin-1-yl]benzenesulfonic acid calcium salt Structure

4-[4-[(2-Nitro-4-sulfophenyl)azo]-3-methyl-5-oxo-2-pyrazolin-1-yl]benzenesulfonic acid calcium salt