2935 - Sulfonamides:

Category 2935 encompasses sulfonamides, a significant class of organic compounds characterized by the presence of a sulfonyl group (-SO2-) directly attached to a nitrogen atom. These compounds are widely utilized in various industries, most notably in pharmaceuticals, where they form the basis of many antibacterial drugs. Their chemical structure allows for diverse functionalization, leading to a broad spectrum of applications beyond medicinal uses, including herbicides and dyestuffs.

Distinguishing category 2935 from its siblings requires understanding the fundamental distinctions within Chapter 29, which covers organic chemicals. While siblings at this level might represent other distinct classes of organic compounds (such as alcohols, aldehydes, or ketones), 2935 is specifically dedicated to the sulfonamide functional group. The classification hinges on the presence of this particular chemical moiety as the defining characteristic of the product.

The subcategories within 2935 further refine the classification based on the specific structure and type of sulfonamide. For instance, subdivisions often differentiate between specific perfluorinated sulfonamides, which have unique properties and applications (e.g., 2935.10 through 2935.50), and a broader "Other" category (2935.90) that captures all remaining sulfonamide compounds not specifically enumerated. This hierarchical structure allows for precise identification and tariffs based on the chemical composition and intended use of the sulfonamide.