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4-Amino-5-hydroxy-3-[p-(2-hydroxyethylsulfonyl)phenylazo]-6-[p-[2-(sodiooxysulfonyloxy)ethylsulfonyl]phenylazo]-2,7-naphthalenedisulfonic acid disodium salt Structure

4-Amino-5-hydroxy-3-[p-(2-hydroxyethylsulfonyl)phenylazo]-6-[p-[2-(sodiooxysulfonyloxy)ethylsulfonyl]phenylazo]-2,7-naphthalenedisulfonic acid disodium salt