2921.49.10.00 - 4-Amino-2-stilbenesulfonic acid and its salts;p-Ethylaniline; 2,4,6-Trimethylaniline (Mesidine); 2,3-Xylidine; 2,4-Xylidine; 2,5-Xylidine; and 3,4-Xylidine

This category encompasses a specific group of aromatic monoamine compounds and their derivatives, further categorized by their chemical structure and lack of certain functional groups that would place them in other headings. The listed substances, including 4-Amino-2-stilbenesulfonic acid and its salts, p-Ethylaniline, 2,4,6-Trimethylaniline (Mesidine), and various xylidine isomers (2,3-, 2,4-, 2,5-, and 3,4-), are distinguished by their aromatic ring structure, the presence of a single amine (-NH2) group attached to the ring, and the absence of nitro groups or other complex substituents that would lead to classification elsewhere.

Within the broader classification of aromatic monoamines and their derivatives, this specific subheading differentiates itself from its sibling categories by excluding compounds such as m-Nitro-p-toluidine. While both are aromatic amines, the presence of the nitro group in m-Nitro-p-toluidine dictates its placement under a different classification, highlighting the importance of specific functional groups in determining tariff treatment.

As this node represents a leaf node within the HTS, there are no further subcategories. The classification is specific to the listed substances and their salts. Therefore, classification under 2921.49.10.00 relies on the precise chemical identity of the imported or exported material matching one of the described compounds. Importers and exporters should verify the chemical composition and ensure it aligns with the specific nomenclature provided to ensure accurate customs declarations.