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1,3-NAPHTHALENEDISULFONIC ACID 7-[[4-[[[[4-[(4,8-DISULFO-2-NAPHTHALENYL)AZO]-2-METHOXY-5-METHYLPHENYL]AMINO]CARBONYL]AMINO]-5-METHOXY-2-METHYLPHENYL]AZO]-,LITHIUM POTASSIUM SODIUM SALT