9902.03.84 - 4,4'-Diamino-2,2'-stilbenedisulfonic acid (CAS No. 81-11-8) (provided for in subheading 2921.59.20)

This HTS classification, 9902.03.84, specifically addresses 4,4'-Diamino-2,2'-stilbenedisulfonic acid, identified by its CAS Number 81-11-8. This compound is a chemical substance recognized within the broader framework of temporary legislation and special classification provisions, as indicated by its placement within Chapter 99. It is important to note that while this substance is classified under this specific temporary provision, it is also "provided for" in subheading 2921.59.20, indicating its underlying classification within the permanent chemical tariff schedule.

Unlike the numerous sibling categories within the HTS which cover a vast array of live animals, agricultural products, and manufactured goods, this node is highly specific. Its existence within Chapter 99 signifies a departure from standard classification, often due to temporary trade agreements, import restrictions, or specific policy measures enacted by legislation such as Section 22 of the Agricultural Adjustment Act. Therefore, it is not comparable to the broad categories of live animals or primary commodities that constitute many of its siblings.

As a leaf node, HTS 9902.03.84 does not possess subcategories. Its classification is definitive for the specified chemical compound. Any variations in the chemical structure, purity, or intended use might necessitate a review of its primary HTS classification under Chapter 29 or other relevant sections of the tariff schedule, rather than altering its status under this specific temporary provision. Classification relies on the precise identification of the imported substance as 4,4'-Diamino-2,2'-stilbenedisulfonic acid (CAS No. 81-11-8).