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5-Oxo-4,5-dihydro-4-phenylazo-1-(4-sodiosulfophenyl)-1H-pyrazole-3-carboxylic acid ethyl ester Structure

5-Oxo-4,5-dihydro-4-phenylazo-1-(4-sodiosulfophenyl)-1H-pyrazole-3-carboxylic acid ethyl ester