双欣环保：公司不生产NMP

Group 1 - The core viewpoint of the article is that Shuangxin Environmental Protection clarified its product offerings and confirmed its entry into the supply chain of upstream electrolyte production for lithium batteries [1] Group 2 - The company does not produce NMP (N-Methyl-2-pyrrolidone) [1] - The company produces DMC (Dimethyl Carbonate) and related products, which have been certified by upstream electrolyte production enterprises in the lithium battery sector [1] - The company's products have successfully entered the supply chain of lithium battery manufacturers [1]