2939.44.00.00 - Norephedrine and its salts

This HTS category, 2939.44.00.00, specifically covers norephedrine and its salts. Norephedrine is a sympathomimetic amine that shares structural similarities with ephedrine and pseudoephedrine but possesses distinct pharmacological properties. It is primarily used in pharmaceutical preparations for its effects on the cardiovascular and respiratory systems, often as a decongestant or bronchodilator. The salts of norephedrine are included as they are common formulations for pharmaceutical use and exhibit the same fundamental chemical identity.

It is crucial to distinguish this category from its siblings. While all fall under the broader classification of alkaloids of ephedra and their derivatives, 2939.44.00.00 is exclusively for norephedrine, differentiating it from ephedrine and its salts (2939.41.00.00), pseudoephedrine (2939.42.00.00), cathine (2939.43.00.00), and levometamfetamine/metamfetamine (2939.45.00.00). The classification hinges on the precise chemical structure and stereochemistry of the alkaloid, as these factors dictate its specific properties and applications.

As this is a leaf node within the HTS, there are no further subdivisions under 2939.44.00.00. Therefore, all forms and salts of norephedrine will be classified here. Classification within this code relies on the confirmed identity of the substance as norephedrine, typically verified through analytical documentation or product specifications, to ensure accurate customs processing.