4-[3-Carbamoyl-4-[m-(2-hydroxyethylsulfonyl)phenylazo]-5-oxo-2-pyrazolin-1-yl]benzenesulfonic acid C??? ??, ??, ??

4-[3-Carbamoyl-4-[m-(2-hydroxyethylsulfonyl)phenylazo]-5-oxo-2-pyrazolin-1-yl]benzenesulfonic acid ?? ?? ? ???

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4-[3-Carbamoyl-4-[m-(2-hydroxyethylsulfonyl)phenylazo]-5-oxo-2-pyrazolin-1-yl]benzenesulfonic acid ?? ??