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4-Amino-3-[p-(2,4-diaminophenylazo)phenylazo]-5-hydroxy-2,7-naphthalenedisulfonic acid dipotassium salt Structure

4-Amino-3-[p-(2,4-diaminophenylazo)phenylazo]-5-hydroxy-2,7-naphthalenedisulfonic acid dipotassium salt