9902.02.66 - 4,4-Dimethoxy-2-butanone (CAS No. 5436-21-5) (provided for in subheading 2914.50.50)

This HTS category, 9902.02.66, specifically classifies 4,4-Dimethoxy-2-butanone (CAS No. 5436-21-5). This chemical compound, a diketone ether, is provided for under subheading 2914.50.50, indicating its primary classification within the organic chemicals chapter. The inclusion of this item within Chapter 99 signifies that it is subject to temporary legislation, modifications proclaimed pursuant to trade agreements, or additional import restrictions under Section 22 of the Agricultural Adjustment Act.

As a temporary provision, this category is distinct from the vast majority of permanent HTS classifications that begin with numerical codes from Chapters 1 through 97. While its parent context, Section XXII, encompasses various temporary and special provisions, 9902.02.66 focuses on a single, specific chemical. Its sibling categories within Chapter 99 would represent other distinct temporary measures or restricted goods, each addressing unique policy objectives.

Since this is a leaf node, there are no further subcategories. Classification under 9902.02.66 is definitive for 4,4-Dimethoxy-2-butanone when imported under the conditions stipulated by the temporary legislation or trade agreements referenced in Chapter 99. Importers must ensure that their documentation accurately reflects the commodity and the specific temporary provisions applicable at the time of entry.