2939.59.00.00 - Other

This HTS classification, 2939.59.00.00, covers "Other" alkaloids, natural or synthesized, and their salts, ethers, esters, and other derivatives, specifically within the context of theophylline and aminophylline groups. It acts as a residual category for derivatives of theophylline and aminophylline that do not fall under more specific enumerations within this HTS heading. Classification here hinges on the chemical structure and the absence of specific enumerations for a particular theophylline or aminophylline derivative.

Distinguishing this category from its sibling, 2939.51.00.00, is crucial. The sibling specifically addresses Fenetylline (INN) and its salts. Therefore, any alkaloid derivative of theophylline or aminophylline that is *not* Fenetylline or its salts would be directed to this residual "Other" classification. The key differentiator lies in the specific identity of the compound, with Fenetylline being explicitly placed in the sibling category.

As this is a leaf node, there are no further subcategories. Consequently, classification under 2939.59.00.00 requires a thorough understanding of the chemical nature of the substance and confirmation that it is indeed a derivative of theophylline or aminophylline and is not specifically provided for elsewhere within Chapter 29, particularly within heading 2939.