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基于 PubChem CID 索引，支持名称 / 同义词 / CAS / SMILES 检索。
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Chlorodifluoromethane and chloropentafluoroethane mixture of Refrigerant gas R 502 with fixed boiling point, with approximately 49% chlorodifluoromethane [UN1973] [Nonflammable gas] CAS 39432-81-0 PubChem CID 38271
FC(F)(F)C(F)(F)Cl.FC(F)Cl