disodium 8-[[3-[(ethylphenylamino)sulphonyl]-4-methylphenyl]azo]-7-hydroxynaphthalene-1,3-disulphonate;8-[[3-[(Ethylphenylamino)sulfonyl]-4-methylphenyl]azo]-7-hydroxy-1,3-naphthalenedisulfonic acid disodium salt
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