2917.19.20.00 - Products described in additional U.S. note 3 to section VI

This HTS category encompasses specific acyclic polycarboxylic acids and their derivatives that are not elsewhere specified or included. It specifically includes maleic acid, succinic acid derived from maleic anhydride or cyclohexane, and glutaric acid derived from cyclopentanone. The scope also extends to anhydrides, halides, peroxides, peroxyacids, and other derivatives of adipic acid, fumaric acid (when derived from aromatic hydrocarbons), maleic acid, succinic acid (as described), and glutaric acid (as described). These are often utilized as intermediates in the synthesis of polymers, plasticizers, and pharmaceuticals.

The "Other" designation within this level signifies that these particular polycarboxylic acids and their derivatives do not fit into more specific, preceding subheadings within the broader classification of acyclic polycarboxylic acids. This category serves as a residual classification for these compounds once more specifically defined groups have been accounted for.

As this is a leaf node, there are no further subcategories. Classification decisions within this HTS code will therefore rely on carefully examining the chemical identity and origin of the specific product to ensure it aligns with the defined list of acids and their derivatives, and that it is not classified under any other HTS provision. For instance, ensuring the succinic acid's derivation from maleic anhydride or cyclohexane, or glutaric acid's derivation from cyclopentanone, is crucial for correct classification.