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4-Amino-5-hydroxy-3,6-bis[p-(p-hydroxyphenylazo)phenylazo]-2,7-naphthalenedisulfonic acid dipotassium salt Structure

4-Amino-5-hydroxy-3,6-bis[p-(p-hydroxyphenylazo)phenylazo]-2,7-naphthalenedisulfonic acid dipotassium salt