potassium sodium 7-hydroxy-8-[[4-(phenylazo)phenyl]azo]naphthalene-1,3-disulphonate;1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-[[4-(phenylazo)phenyl]azo]-,potassium sodium salt;1,3-Naphthalenedisulfonic acid,7-hydroxy-8-[[4-(phenylazo)phenyl]azo]-,potassium sodium salt
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