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4-Amino-5-hydroxy-6-[5-[2-(hydroxymethoxyphenylazo]-3-[4-[2-(hydroxysulfonyloxy)ethylsulfonyl]phenylazo]-2,7-naphthalenedisulfonic acid or mono,di,tri or tetrasodium salt Structure

4-Amino-5-hydroxy-6-[5-[2-(hydroxymethoxyphenylazo]-3-[4-[2-(hydroxysulfonyloxy)ethylsulfonyl]phenylazo]-2,7-naphthalenedisulfonic acid or mono,di,tri or tetrasodium salt