2915.90.18 - Other

This HTS category, 2915.90.18, encompasses "Other" saturated acyclic monocarboxylic acids and their derivatives not specifically enumerated elsewhere within the 2915.90 subheading. It serves as a residual category for a wide array of organic compounds that share the fundamental structure of a saturated acyclic monocarboxylic acid but do not fit into more precisely defined classifications. This can include various esters, amides, or other functionalized derivatives of such acids.

The critical distinction of 2915.90.18 from its sibling category, 2915.90.14.00 (Valproic acid), lies in specificity. While Valproic acid is a distinct, well-defined pharmaceutical compound, this "Other" category captures any other saturated acyclic monocarboxylic acid derivative that does not possess the unique chemical identity or common trade name of valproic acid. Therefore, the classification hinges on identifying the core acid structure and its saturation, acyclic nature, and monocarboxylic functionality, along with any derivative group, provided it is not explicitly covered elsewhere.

Within 2915.90.18, further subdivisions exist to refine classification based on specific chemical characteristics. The subcategory 2915.90.18.10 specifically addresses perfluorooctanoic acids and their salts, which are significant industrial chemicals. All other remaining saturated acyclic monocarboxylic acids and their derivatives not falling under this perfluorinated designation are then classified under the residual subcategory 2915.90.18.90. This hierarchical structure ensures that even less common but distinct derivatives can be accurately classified.