2921.45.10.00 - 7-Amino-1,3-naphthalenedisulfonic acid and its salts; 5-Amino-2-naphthalenesulfonic acid and its salts; 8-Amino-1-naphthalenesulfonic acid and its salts; andN-Phenyl-2-naphthylamine

This HTS category, 2921.45.10.00, specifically classifies a defined set of amino-naphthalenesulfonic acids and their salts, along with N-Phenyl-2-naphthylamine. The covered substances are: 7-Amino-1,3-naphthalenedisulfonic acid and its salts, 5-Amino-2-naphthalenesulfonic acid and its salts, 8-Amino-1-naphthalenesulfonic acid and its salts, and N-Phenyl-2-naphthylamine. These compounds are primarily used as intermediates in the synthesis of dyes and pigments, and in some specialized chemical applications.

This classification is distinguished from its siblings by the precise chemical structures of the included naphthalenesulfonic acid derivatives and the specific inclusion of N-Phenyl-2-naphthylamine. For instance, sibling category 2921.45.20.00 covers a different assortment of amino-naphthalenesulfonic acids and their salts, such as 3-Amino-2,7-naphthalenedisulfonic acid and 8-Anilino-1-naphthalenesulfonic acid, and also includes N-Ethyl-1-naphthylamine, which is not found in this direct grouping. Similarly, 2921.45.25.00 includes mixtures of specific amino-naphthalene sulfonic acids and o-Naphthionic acid.

As this node represents a leaf node within the HTS database, there are no further subcategories to introduce. Classification within 2921.45.10.00 therefore relies solely on the accurate identification of the merchandise as one of the four explicitly listed compounds or their respective salts. The presence of a sulfonic acid group and an amino group on the naphthalene ring, along with the specific arrangement and substitution patterns, are key criteria for classification under this heading.