2921.42.36.00 - m-Chloroaniline; 2-Chloro-4-nitroaniline; 2,5-Dichloroaniline-4-sulfonic acid and its monosodium salt; 2,4-Dinitroaniline;o-Nitroaniline-p-sulfonic acid, sodium salt; and 2,3,4-Trifluoroaniline

This HTS category encompasses a specific group of substituted aniline derivatives, characterized by the presence of chlorine, nitro, or sulfonic acid groups, or a combination thereof, on the aniline ring. It includes compounds such as m-Chloroaniline, 2-Chloro-4-nitroaniline, 2,5-Dichloroaniline-4-sulfonic acid and its monosodium salt, 2,4-Dinitroaniline, o-Nitroaniline-p-sulfonic acid sodium salt, and 2,3,4-Trifluoroaniline. These are primarily organic intermediates used in the synthesis of dyes, pigments, pharmaceuticals, and agricultural chemicals.

Distinguishing this category from its siblings lies in the precise substitution pattern and functional groups present on the aniline molecule. For instance, while other sibling categories might cover simpler aniline derivatives like N,N-dimethylaniline or N-ethylaniline, or those with different halogen or nitro substitutions, this node specifically groups together those with chloro, nitro, sulfonic acid, and fluoro substitutions as detailed in its description. The presence of sulfonic acid groups, in particular, often imparts water solubility and is a key differentiating factor.

As a leaf node, this category has no further subcategories. Therefore, the classification of a product under this code hinges directly on its identity matching one of the listed chemical names or its structural characteristics aligning with the described substitutions. Careful verification of the chemical composition and naming conventions is crucial for accurate classification within this specific group of aromatic monoamine derivatives.