2933.79.20.00 - N-Methyl-2-pyrrolidone; and 2-Pyrrolidone

This HTS classification, 2933.79.20.00, specifically covers N-Methyl-2-pyrrolidone and 2-Pyrrolidone. These are cyclic organic compounds containing a nitrogen atom within a five-membered ring structure, characterized by a lactam functional group (a cyclic amide). N-Methyl-2-pyrrolidone (NMP) is a widely used polar aprotic solvent with applications in petrochemical processing, electronics manufacturing, and pharmaceuticals. 2-Pyrrolidone, also known as gamma-butyrolactam, serves as a key intermediate in the production of polymers, pharmaceuticals, and other fine chemicals.

Distinguishing this category from its siblings is crucial for accurate classification. While all fall under "Other lactams," 2933.79.30.00 is reserved for the monomer N-Vinyl-2-pyrrolidone, a distinct compound utilized primarily in the production of polymers like polyvinylpyrrolidone. Similarly, 2933.79.40.00 is for 12-Aminododecanoic acid lactam, a longer-chain lactam with different chemical properties and applications. The residual category, 2933.79.85.00, is for all other lactams not specifically enumerated.

As this is a leaf node, there are no further subcategories within 2933.79.20.00. Therefore, the classification relies solely on identifying the presence of N-Methyl-2-pyrrolidone or 2-Pyrrolidone as the primary chemical constituent. Importers and exporters should ensure that the goods being declared precisely match the chemical identity of these named compounds to utilize this specific tariff heading.