2930.90.49 - Other

This HTS category, 2930.90.49, encompasses a broad range of organo-sulfur compounds that do not fall under more specific classifications within heading 2930. It specifically includes "other" organo-sulfur compounds not otherwise specified, particularly those that are derivatives of organic acids containing sulfur. These compounds are characterized by the presence of sulfur bonded to carbon atoms within an organic molecule, often as thiols, thioethers, or sulfinic acids, and are utilized in various industrial and chemical applications.

Distinguishing this category from its sibling, 2930.90.46 (dl-Hydroxy analogue of dl-methionine), is crucial. While the sibling refers to a very specific synthetic amino acid analogue, this category is a residual classification for a wide array of other organo-sulfur compounds that do not meet the precise definition of the sibling or any other more granular subcategory. The presence of sulfur in organic acids is a key characteristic, but the specific arrangement and functional groups will determine its placement within or outside of this "other" designation.

The subcategories under 2930.90.49 further refine the classification of these remaining organo-sulfur compounds. 2930.90.49.10 specifically addresses thioglycolic acid and its derivatives, while 2930.90.49.20 covers other mercaptocarboxylic acids. The residual category, 2930.90.49.50, serves as a final catch-all for any organo-sulfur compound that fits within the broader scope of 2930.90.49 but is not specifically listed under the preceding subcategories. This hierarchical structure allows for precise tariff classification based on the chemical identity and structure of the imported or exported goods.