9902.05.24 - 2-Mercaptoethanol (2-sulfanylethanol) (CAS No. 60-24-2) (provided for in subheading 2930.90.91)

This HTS classification, 9902.05.24, pertains to the chemical compound 2-Mercaptoethanol, also known as 2-sulfanylethanol. Its CAS Number is 60-24-2. This specific classification is utilized under Section XXII, which covers Special Classification Provisions, Temporary Legislation, and modifications proclaimed pursuant to trade agreements or Section 22 of the Agricultural Adjustment Act. Importantly, this subheading indicates that while 2-Mercaptoethanol is recognized for import/export, its primary tariff treatment is typically found under subheading 2930.90.91, implying a standard classification for its chemical nature.

Given that this is a leaf node within Chapter 99, there are no further subcategories to explore. The primary function of this classification is to act as a specific entry point for 2-Mercaptoethanol within the context of special or temporary trade provisions. Unlike the broad categories found in earlier chapters, such as live animals (Chapters 01), which are classified based on species and condition, this entry is for a single, well-defined chemical substance. Its distinction lies in its placement within a chapter dedicated to temporary legislation and trade agreement modifications, rather than its inherent physical properties or end-use, which would typically dictate classification in other HTS sections.