2917.20.00.00 - Cyclanic, cyclenic or cycloterpenic polycarboxylic acids, their anhydrides, halides, peroxides, peroxyacids and their derivatives

This HTS category, 2917.20.00.00, encompasses cyclic polycarboxylic acids and their derivatives. Specifically, it covers compounds where the carboxylic acid groups are attached to a carbocyclic ring structure, including cyclanic (saturated), cyclenic (unsaturated), and cycloterpenic (derived from terpenes) ring systems. The derivatives included are anhydrides, halides, peroxides, peroxyacids, and other related compounds formed from these cyclic polycarboxylic acids. Examples include cyclohexane-1,2-dicarboxylic acid and its anhydride.

This category is distinct from its sibling categories, which cover acyclic (non-cyclic) and aromatic polycarboxylic acids, respectively. The key differentiator is the presence of a carbocyclic ring as the central structural element of the molecule. Acyclic polycarboxylic acids, for instance, possess linear or branched carbon chains connecting the carboxylic acid groups, while aromatic polycarboxylic acids feature benzene rings or similar aromatic systems.

As this is a leaf node within the HTS classification, there are no further subcategories for this specific code. Therefore, classification within 2917.20.00.00 relies on accurately identifying the cyclic nature of the polycarboxylic acid or its derivative. Customs professionals should verify that the core structure of the chemical substance is indeed a cyclanic, cyclenic, or cycloterpenic ring system to ensure correct application of this heading.