9902.03.93 - (2S,3S,4R)-2-Amino-1,3,4-octadecanetriol hydrochloride (Phytosphingosine HCl) (CAS No. 154801-32-8) (provided for in subheading 2922.19.96)

This HTS code, 9902.03.93, designates a specific temporary classification for (2S,3S,4R)-2-Amino-1,3,4-octadecanetriol hydrochloride, also known as Phytosphingosine HCl. This compound is a synthetic or naturally derived sphingoid base, which plays a crucial role in cell membrane structure and signaling. Its classification under Chapter 99 indicates it is subject to temporary legislation or modifications, often related to trade agreements or specific import restrictions. The parenthetical note "provided for in subheading 2922.19.96" clarifies that its primary chemical classification would be within organic compounds containing an amino group, but for the purposes of this temporary provision, it is uniquely categorized here.

Unlike its many sibling categories, which encompass a broad spectrum of live animals and their immediate products, this HTS code pertains to a highly specific organic chemical compound. The vast majority of Chapter 99 codes are also distinct from the core product chapters and often relate to unique trade measures, special programs, or temporary duty adjustments rather than the inherent nature of the goods themselves. Therefore, distinguishing this entry involves understanding its role as a chemically defined substance subject to special tariff treatment, rather than a general commodity.

As a leaf node, HTS code 9902.03.93 has no further subcategories. This means that any import of Phytosphingosine HCl falling under this specific temporary provision would be classified directly to this code. The classification criteria rely on the precise chemical identity and the prevailing temporary legislative measures governing its importation. Importers must confirm that the product precisely matches the chemical description and that the conditions for its temporary classification are met.