2922.49 - Other:

This HTS category, 2922.49, encompasses amino-acids, other than those with multiple oxygen functions, and their esters and salts, that are not specifically classified elsewhere within the 2922.40 series. It serves as a residual category for amino-acid derivatives that do not fall under the more specific subheadings for lysine, glutamic acid, anthranilic acid, or tilidine. The key criterion for inclusion here is the presence of a single oxygen function and an amino group within the molecular structure, excluding compounds with additional oxygen-containing functional groups like hydroxyls or carboxyls beyond those inherent in the amino-acid structure itself.

The distinction from sibling categories is crucial for accurate classification. Unlike 2922.41 (lysine), 2922.42 (glutamic acid), 2922.43 (anthranilic acid), and 2922.44 (tilidine), this category is not defined by specific named amino-acids or their derivatives but rather by their exclusion from those explicit listings. Therefore, if an amino-acid or its ester/salt does not possess the molecular structure of lysine, glutamic acid, anthranilic acid, or tilidine, and it contains only one type of oxygen function (in addition to the amino group), it would likely be classified under 2922.49.

This category is further subdivided to differentiate between aromatic and other (aliphatic) amino-acid derivatives. The "Aromatic" subheading will capture amino-acids where the amino and carboxyl groups are attached to an aromatic ring system, while the "Other" subheading will encompass those where these functional groups are attached to an aliphatic chain. This structural differentiation allows for more granular classification within the broader scope of amino-acids not otherwise specified.