2925.29.18.00 - N,N'-Diphenylguanidine; 3-Dimethyl amino methyleneiminophenol hydrochloride; 1,3-Di-o-tolylguanidine; andN,N-Dimethyl-N'-[3-[[(methylamino) carbonyl]- oxy] phenyl] methanimidamide monohydro- chloride 🖩

This HTS category encompasses specific imine derivatives and their salts that do not fall under other more narrowly defined headings within the "Aromatic" subcategory of imines. The listed examples, including N,N'-Diphenylguanidine and its related compounds, represent a diverse group of aromatic organic chemicals characterized by the presence of imine functional groups. These substances are primarily used in various industrial applications, often as intermediates or catalysts in chemical synthesis.

Distinguishing this category from its sibling, 2925.29.10.00, relies on the specific chemical structures of the compounds. The sibling category exclusively covers N'-(4-Chloro-o-tolyl)-N,N-dimethylformamidine, Bunamidine hydrochloride, and Pentamidine. In contrast, the present classification is reserved for other aromatic imines and their salts that are not explicitly named in the preceding sibling, emphasizing a residual or "other" classification principle for distinctly structured aromatic imines.

As this classification represents a leaf node, there are no further subcategories to introduce. Classification within this heading is therefore determined by whether a specific aromatic imine or its salt matches the chemical definitions and examples provided, and is not otherwise classified under more specific HTS provisions at the same or higher levels.