2921.22.50.00 - Other

This HTS category, 2921.22.50.00, encompasses "Other" acyclic polyamines and their derivatives, specifically excluding those that are salts. It falls under the broader heading of hexamethylenediamine and its salts. The scope here is for compounds that fit the definition of acyclic polyamines, possess the structural characteristics of hexamethylenediamine or its derivatives, but are not in a salt form.

This classification serves as a residual category within the hexamethylenediamine subheadings. It is distinguished from its sibling, 2921.22.10.00, which specifically covers hexamethylenediamine and its derivatives that are *derived in whole or in part from adipic acid*. Therefore, to classify under 2921.22.50.00, the substance must be an acyclic polyamine, related to hexamethylenediamine, not a salt, and not demonstrably derived from adipic acid.

As this is a leaf node, there are no further subcategories for this specific HTS code. Classification at this level requires a thorough understanding of the chemical structure and synthetic origin of the compound to ensure accurate differentiation from other related entries, particularly those derived from adipic acid.