9902.03.91 - Phytosphingosine ((2S,3S,4R)-2-amino-1,3,4-octadecanetriol) (CAS No. 13552-11-9) (provided for in subheading 2922.19.96)

This HTS category, 9902.03.91, specifically covers phytosphingosine, a type of amino alcohol with the chemical designation (2S,3S,4R)-2-amino-1,3,4-octadecanetriol. Its CAS number is 13552-11-9, and it is designated for temporary classification under subheading 2922.19.96 of the Harmonized Tariff Schedule. This classification falls under Section XXII, which pertains to special provisions, temporary legislation, and import restrictions.

Unlike the primary HTS classifications that deal with general categories of goods such as live animals (e.g., 0101, 0102), Chapter 99 is reserved for temporary measures, trade agreement modifications, and specific restrictions like those enacted under Section 22 of the Agricultural Adjustment Act. Therefore, while other HTS chapters categorize commodities based on their inherent nature and intended use, this specific HTS code represents a temporary or provisional classification for phytosphingosine, indicating it is subject to special regulatory treatment outside of its permanent chemical classification.

As a leaf node, HTS 9902.03.91 does not have further subdivisions. The classification of phytosphingosine under this code is definitive for the described material. Importers should refer to the specific temporary legislation or proclamations associated with this HTS number for precise details regarding duty rates, entry requirements, or any quantitative restrictions that may apply.