2933.99.55.30 - Tolmetin sodium (anhydrous)

This HTS classification, 2933.99.55.30, specifically covers Tolmetin sodium in its anhydrous form. Tolmetin sodium is a nonsteroidal anti-inflammatory drug (NSAID) used for its analgesic, antipyretic, and anti-inflammatory properties. The "anhydrous" designation is critical, indicating that this particular entry represents the compound without any incorporated water molecules, distinguishing it from hydrated forms. This classification falls under the broader category of drugs primarily affecting the central nervous system, and more specifically, within the subcategory of analgesics, antipyretics, and nonhormonal anti-inflammatory agents, reflecting its therapeutic application.

The distinction between 2933.99.55.30 and its sibling categories is based on the physical state and hydration level of Tolmetin sodium. HTS code 2933.99.55.10 covers Tolmetin itself, the active pharmaceutical ingredient before it is formulated as a salt. HTS code 2933.99.55.20 is reserved for Tolmetin sodium dihydrate, which contains two molecules of water per molecule of the salt. Therefore, 2933.99.55.30 is exclusively for the anhydrous version, emphasizing the precise chemical composition relevant for tariff purposes. The "Other" category, 2933.99.55.90, is a residual classification for any other related compounds or forms not specifically enumerated.

As this classification node is a leaf node within the HTS, there are no further subcategories to introduce. Classification at this level is therefore precise and relies on the accurate identification of Tolmetin sodium as anhydrous. Importers and exporters must ensure their documentation clearly indicates the anhydrous state of the product to ensure correct classification and compliance with customs regulations. This specificity is crucial for determining applicable duties, quotas, and any other trade requirements associated with the import or export of this pharmaceutical substance.