2933.99.55.20 - Tolmetin sodium dihydrate

This HTS category, 2933.99.55.20, specifically classifies **Tolmetin sodium dihydrate**. Tolmetin is a nonsteroidal anti-inflammatory drug (NSAID) used to relieve pain, tenderness, swelling, and stiffness caused by arthritis and other similar conditions. The "sodium dihydrate" designation indicates that the compound is in its sodium salt form and contains two molecules of water of hydration. This specific hydration state is a key criterion for its classification under this particular sub-heading.

This category is distinct from its sibling, 2933.99.55.10, which covers Tolmetin in its anhydrous (water-free) form, and 2933.99.55.30, which classifies Tolmetin sodium in its anhydrous form. The presence or absence of water of hydration, as well as the specific salt form, are crucial differentiating factors for accurate classification within these closely related sub-headings. The "Other" category at 2933.99.55.90 serves as a residual classification for any other variations or forms of Tolmetin not specifically enumerated.

As a leaf node within the HTS structure, this sub-heading does not have further subdivisions. Therefore, classification into 2933.99.55.20 relies entirely on the precise chemical identity of the substance as Tolmetin sodium dihydrate. Importers and exporters must ensure their documentation accurately reflects this specific form of the drug to comply with customs regulations.