2922.29.81.90 - Other

This HTS classification, 2922.29.81.90, encompasses a residual category for amino-naphthols and amino-phenols that do not fall under more specific subheadings within the broader "Other" classification. These compounds are characterized by the presence of both an amino group (-NH2) and a hydroxyl group (-OH) attached to a naphthol or phenol ring structure, with any ether or ester derivatives also included. Their salts are likewise classified here if they meet the primary structural criteria. This category serves as a catch-all for such compounds when they are not explicitly detailed elsewhere in the tariff schedule.

The distinction of this subheading lies in its exclusionary nature. Unlike the sibling category 2922.29.81.10, which specifically identifies p-Nitro-o-anisidine, this classification is for all other amino-naphthols and amino-phenols, their ethers, esters, and salts that do not fit into more precisely defined subcategories. The absence of specific functional group limitations beyond the primary amino and hydroxyl functionalities, and the lack of a specific isomer or derivative identification, differentiates it from more narrowly defined HTS codes.

As a leaf node, this classification has no further subcategories. Therefore, its application relies heavily on the residual principle of customs classification. Importers and exporters should consult the foundational definitions for amino-naphthols and amino-phenols within Chapter 29 and ensure that any compound being classified here does not meet the criteria for any more specific subheading, either at this level or at higher levels within the Harmonized Tariff Schedule. This ensures accurate duty assessment and compliance with trade regulations.