9902.02.63 - 1-Hydroxy-2-methylpentan-3-one (CAS No. 27970-79-2) (provided for in subheading 2914.40.90)

This HTS classification, 9902.02.63, pertains to the specific chemical compound 1-Hydroxy-2-methylpentan-3-one, also identified by its CAS number 27970-79-2. This designation falls under Chapter 99 of the Harmonized Tariff Schedule, which is reserved for temporary legislation, modifications proclaimed pursuant to trade agreements, and additional import restrictions. Therefore, the inclusion of this substance under 9902.02.63 indicates it is subject to special, often temporary, regulatory controls or duties beyond its standard classification under the main body of the HTS.

Given that this is a leaf node within Chapter 99, there are no further subdivisions. Its placement here signifies a specific, currently active, temporary trade provision impacting the importation of this particular chemical. The parenthetical note "(provided for in subheading 2914.40.90)" is crucial, indicating that while the substance itself would ordinarily be classified under the general category of ketones and its derivatives (specifically subheading 2914.40.90, which covers other ketones and ketone-alcohols), its importation is currently governed by the special rules or restrictions stipulated in this Chapter 99 code. This dual classification highlights the need for importers to consult both the specific Chapter 99 provision and the underlying permanent HTS classification to ensure compliance.