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3-[[5-Hydroxy-8-(2-methylsulfonyl-4-nitrophenylazo)-1-naphtyl]aminosulfonyl]benzenesulfonic acid potassium salt Structure

3-[[5-Hydroxy-8-(2-methylsulfonyl-4-nitrophenylazo)-1-naphtyl]aminosulfonyl]benzenesulfonic acid potassium salt