2-Naphthalenesulfonic acid, 5(or 8)-(2-(4-ethoxy-2-methylphenyl)diazenyl)-8(or 5)-(2-phenyldiazenyl)-, sodium salt (1:1);2-Naphthalenesulfonic acid, 5(or 8)-((4-ethoxy-2-methylphenyl)azo)-8(or 5)-(phenylazo)-, sodium salt;Sodium (5or8)-((4-ethoxy-2-methylphenyl)azo)-(8or5)-(phenylazo)naphthalene-2-sulphonate;sodium 5-[(E)-(4-ethoxy-2-methylphenyl)diazenyl]-8-[(E)-phenyldiazenyl]naphthalene-2-sulfonate
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