2921.19 - Other:

This HTS category, 2921.19, encompasses acyclic monoamines and their derivatives, as well as their salts, that are not specifically enumerated in the preceding subheadings of 2921.1. It broadly covers a range of simple and more complex acyclic amine compounds.

Distinct from its siblings, 2921.19 is a residual category. Unlike 2921.11 which specifically addresses methylamines and their salts, or 2921.12 through 2921.14 which detail particular chloroethyl hydrochloride derivatives of amines, this category applies to all other compounds fitting the broader description of acyclic monoamines and their salts. The key differentiator lies in the specific chemical structure and common names designated in the sibling categories.

The subcategories within 2921.19 further refine the classification. 2921.19.11.00 groups various ethyl, propyl, and butyl monoamines and their salts, providing a specific designation for these common acyclic amines. 2921.19.31.00 then captures a more niche set of compounds including 3-amino-3-methyl-1-butyne and a specific (dimethylamino)isopropyl chloride hydrochloride. Finally, 2921.19.61 acts as a further residual for any remaining acyclic monoamines and their derivatives, and salts thereof, not covered by the more specific subheadings.