2931.49.00.08 - [O-2-(Dialkyl (methyl, ethyl, n-propyl or isopropyl) amino)ethyl] hydrogen alkyl (methyl, ethyl, n-propyl or isopropyl) phosphonites and their O-alkyl (≤C10, including cycloalkyl) esters; alkylated or protonated salts thereof

This HTS category, 2931.49.00.08, encompasses a specific group of organophosphorous compounds. It includes compounds known as [O-2-(Dialkyl (methyl, ethyl, n-propyl or isopropyl) amino)ethyl] hydrogen alkyl (methyl, ethyl, n-propyl or isopropyl) phosphonites, along with their O-alkyl (≤C10, including cycloalkyl) esters. Furthermore, the classification extends to any alkylated or protonated salts of these particular phosphonites and esters. These substances are characterized by the presence of both phosphorus and nitrogen atoms, linked through organic groups.

This classification is distinct from its sibling categories within 2931.49.00.00, which cover other organophosphorous derivatives. For example, 2931.49.00.05 refers to phosphoramidocyanidates, while 2931.49.00.10 and 2931.49.00.20 specifically classify glufosinate and glyphosate, respectively, along with their salts and esters. Other siblings like 2931.49.00.15 and 2931.49.00.25 deal with simpler phosphinate and phosphonate esters. The defining characteristic of 2931.49.00.08 lies in the specific structural arrangement of the aminoethyl group attached to the phosphonite or phosphonate ester moiety.

As a leaf node in the HTS classification system, 2931.49.00.08 does not have any further subdivisions. Therefore, all goods meeting the descriptive criteria outlined above will be classified directly under this code. Importers and exporters should carefully examine the chemical structure and composition of their products to ensure accurate classification within this specific sub-heading, paying close attention to the type of alkyl groups present on both the amino and phosphonite/phosphonate ester portions of the molecule, as well as the chain length of any O-alkyl esters.