2926.90.50 - Other

This HTS category, 2926.90.50, encompasses nitrile-function compounds that are not specifically enumerated under other headings within Chapter 29. It serves as a residual category for compounds containing a nitrile group (-C≡N) where the specific chemical structure or application does not fit into more precisely defined subheadings. These substances are characterized by the presence of at least one nitrile group, which can be attached to aliphatic or non-aromatic cyclic radicals.

Unlike the sibling category for "Aromatic" nitrile-function compounds (e.g., benzonitrile derivatives), this classification is reserved for compounds where the nitrile group is not directly attached to an aromatic ring. The distinction is based on the chemical structure of the molecule, specifically the absence of a benzene ring or other aromatic system directly bonded to the nitrile functional group.

Within this "Other" category, further subdivisions exist to provide more granular classification. For instance, malononitrile (2926.90.50.10) is specifically classified here, distinguishing it from other, less common nitrile compounds. The remaining "Other" subcategory (2926.90.50.50) captures all other nitrile-function compounds that do not fall under malononitrile or the aromatic nitrile provisions, requiring careful analysis of their chemical composition and structure.