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3-[(4-Aminophenyl)azo]-4-hydroxy-5-[[(4-methylphenyl)sulfonyl]amino]-2,7-naphthalenedisulfonic acid disodium salt Structure

3-[(4-Aminophenyl)azo]-4-hydroxy-5-[[(4-methylphenyl)sulfonyl]amino]-2,7-naphthalenedisulfonic acid disodium salt