9902.08.73 - Solvent Yellow 163 (1,8-Bis(phenylthio)anthracene-9,10-dione) (CAS No. 13676-91-0) (provided for in subheading 3204.19.20)

This HTS category, 9902.08.73, specifically covers Solvent Yellow 163, identified chemically as 1,8-Bis(phenylthio)anthracene-9,10-dione (CAS No. 13676-91-0). This classification falls under the special provisions for temporary legislation and modifications, indicating it is subject to specific import restrictions or conditions outside of the standard classification chapters. The parenthetical note "(provided for in subheading 3204.19.20)" clarifies its primary classification under dyes and pigments, but its presence in Chapter 99 signifies a distinct set of regulatory considerations.

As a leaf node within Chapter 99, this category does not have further subdivisions. Its unique purpose is to track and potentially restrict or manage the import of this specific chemical compound, Solvent Yellow 163, which is a synthetic organic dye. The distinction from other entries in Chapter 99 would lie in the specific temporary legislative provision or trade agreement modification that necessitates its separate HTS code and associated import requirements. These requirements are typically implemented for specific policy objectives, such as national security, agricultural protection, or to enforce international agreements, and are separate from the general classification of goods by material or function found in earlier chapters of the HTS.