9902.05.66 - (RS)-5-Amino-1-[2,6-dichloro-4-(trifluoromethyl)phe- nyl]-4-(trifluoromethysulfinyl)-1H-pyrazole-3-carbonitrile (Fipronil) (CAS No. 120068-37-3) (provided for in subheading 2933.19.23)

This HTS category, 9902.05.66, specifically covers the compound (RS)-5-Amino-1-[2,6-dichloro-4-(trifluoromethyl)phenyl]-4-(trifluoromethylsulfinyl)-1H-pyrazole-3-carbonitrile, commonly known as Fipronil, and identified by CAS No. 120068-37-3. While the primary classification for this chemical substance is found under subheading 2933.19.23, its inclusion within Chapter 99 signifies a temporary modification or restriction related to import. This chapter is reserved for special classification provisions, temporary legislation, and measures enacted under Section 22 of the Agricultural Adjustment Act, indicating potential trade agreement impacts or specific import limitations for this particular product.

Distinguishing this node from its sibling categories, which generally encompass live animals, is straightforward. The HTS system employs a hierarchical structure where broad categories like "Live Animals" (Chapters 01) are followed by more specific classifications based on product type, material, or function. In this instance, 9902.05.66 falls under a distinct section and chapter dedicated to temporary measures, clearly separating it from the core product-based classifications of earlier chapters.

As a leaf node, 9902.05.66 does not have any subcategories. The specific nature of this classification, as a temporary measure for a precisely identified chemical compound, means it is the most granular level of detail within its current hierarchical placement for the purpose of special import provisions.