2934.91.00.00 - Aminorex (INN), brotizolam (INN), clotiazepam (INN), cloxazolam (INN), dextromoramide (INN), haloxazolam (INN), ketazolam (INN), mesocarb (INN), oxazolam (INN), pemoline (INN), phendimetrazine (INN), phenmetrazine (INN) and sufentanil (INN); salts thereof

This HTS category, 2934.91.00.00, specifically enumerates a list of controlled substances, primarily pharmaceuticals and their salts, that are classified as heterocyclic compounds. These include well-known compounds such as Aminorex, Brotizolam, Sufentanil, and Phendimetrazine, all of which are identified by their International Nonproprietary Names (INN). The classification hinges on the precise chemical identity of these specific named substances.

It is crucial to distinguish this category from its sibling, 2934.92.00.00, which covers "Other fentanyls and their derivatives." While Sufentanil is listed under 2934.91.00.00, this sibling category is intended for fentanyl compounds and their variations that are *not* explicitly named in 2934.91.00.00. Furthermore, 2934.99.00.00 serves as a residual category for other heterocyclic compounds not otherwise specified, underscoring the specificity required for classification under 2934.91.00.00.

As this node represents a leaf node within the HTS, there are no further subcategories. Therefore, classification within 2934.91.00.00 relies entirely on the presence and identification of the precisely listed substances, their salts, and derivatives as described. Importers and exporters must verify the exact chemical name against this specific list to ensure accurate classification.