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​Sodium methylenebis(naphthalenesulfonate), also known as disodium methylenebisnaphthalenesulphonate, is an organic compound with the molecular formula C₂₁H₁₄Na₂O₆S₂ and a molecular weight of 472.44 g/mol. It typically appears as a light yellow powder that is easily soluble in water, forming stable aqueous solutions. The compound is characterized by two naphthalene sulfonate groups linked by a methylene bridge, which imparts its anionic surfactant properties. ​

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