2933.39.61 - Products described in additional U.S. note 3 to section VI

This HTS subheading, 2933.39.61, encompasses specific heterocyclic organic compounds that contain at least one nitrogen atom within an unfused pyridine ring structure. Crucially, the products falling under this code are those explicitly enumerated in Additional U.S. Note 3 to Section VI of the Harmonized Tariff Schedule. This note provides a definitive list of substances, ensuring precise classification for trade purposes.

Distinguishing this category from its sibling, 2933.39.92, which broadly covers "Other" compounds not otherwise specified, is the specific reference to Additional U.S. Note 3. While both subheadings capture compounds with unfused pyridine rings, 2933.39.61 is reserved for only those substances that meet the criteria outlined in that particular note. This means items classified here are a subset of the broader "Other" category at the preceding level, reserved for uniquely defined chemical entities.

The subcategories within 2933.39.61 further refine the classification by identifying specific chemical compounds or classes of compounds. These include 3-Quinuclidinyl benzilate, a well-defined chemical entity, as well as complex dibromide salts with specific structural and alkyl chain length requirements. The existence of these distinct sub-classifications underscores the need for precise identification of the chemical structure and any accompanying counter-ions or functional groups to ensure accurate import and export declarations.