9902.07.53 - 3-({[5-(Difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H- pyrazol-4-yl]methyl}sulfonyl)-5,5-dimethyl-4,5- dihydro-1,2-oxazole (Pyroxasulfone) (CAS No. 447399-55-5) (provided for in subheading 2934.99.90)

This HTS category, 9902.07.53, specifically designates Pyroxasulfone (CAS No. 447399-55-5), a chemical compound identified as 3-({[5-(Difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl]methyl}sulfonyl)-5,5-dimethyl-4,5-dihydro-1,2-oxazole. It falls under Chapter 99, which is reserved for temporary legislation and modifications. Therefore, this classification applies to Pyroxasulfone when subject to specific, time-limited import regulations or restrictions proclaimed under trade agreements or Section 22 of the Agricultural Adjustment Act.

Unlike the primary HTS classifications for chemical compounds found in Chapters 28 and 29, this entry under Chapter 99 indicates a temporary, often duty-related, treatment. While Pyroxasulfone itself would typically be classified under subheading 2934.99.90 based on its chemical structure as a heterocyclic compound containing nitrogen, its appearance in Chapter 99 signifies a unique customs status. This is not a standard chemical classification but rather a provision to manage specific trade or policy measures affecting this particular substance.

As this is a leaf node, there are no further subcategories under HTS 9902.07.53. The classification is highly specific, focusing solely on Pyroxasulfone under temporary legislative provisions. Classification decisions for this entry will depend entirely on the prevailing temporary legislation or proclaimed restrictions at the time of import, rather than the inherent chemical properties that would dictate classification in the core chapters of the HTS.