2917.19.35.00 - Malonic acid

This category encompasses malonic acid, a dicarboxylic acid with the chemical formula CH₂(COOH)₂. Malonic acid serves as an important building block in organic synthesis, particularly in the production of barbiturates, pharmaceuticals, flavors, and fragrances. Its classification here under "Other" within acyclic polycarboxylic acids indicates that it is not specifically enumerated in preceding subheadings within heading 2917.

Distinguishing malonic acid from its siblings requires careful attention to its chemical structure and specific applications. For instance, while other entries at this level might cover fumaric acid, maleic acid, succinic acid, or specific derivatives of adipic acid and glutaric acid, malonic acid is characterized by its three-carbon backbone with carboxyl groups on the terminal carbons and a single methylene group in between. It is distinct from compounds like ferrous fumarate (an iron salt of fumaric acid) or ethylene brassylate (a macrocyclic ester used in perfumery).

As this is a leaf node, there are no further subcategories to introduce. Therefore, the classification of malonic acid under 2917.19.35.00 relies on its precise chemical identity and the absence of more specific headings or subheadings within the broader scope of polycarboxylic acids and their derivatives. Importers and exporters should ensure that the product's declaration accurately reflects it as malonic acid to avoid misclassification.