9902.05.22 - 2-Mercaptoethanol (CAS No. 60-24-2) (provided for in subheading 2930.90.91)

HTS Code 9902.05.22 specifically covers 2-Mercaptoethanol, identified by its Chemical Abstracts Service (CAS) number 60-24-2. This substance is a chemical compound, often used as a reducing agent in biochemistry and molecular biology, and as a component in certain industrial processes. Its inclusion in Chapter 99 signifies a temporary legislative measure or modification impacting its import.

Distinguishing this specific entry from its sibling categories, which would generally cover a broad range of goods under Section XXII and Chapter 99, is crucial. While other Chapter 99 subheadings might address various temporary tariffs, quotas, or restrictions on different product types or under different trade agreements, 9902.05.22 is narrowly defined to apply solely to 2-Mercaptoethanol. This implies that specific trade or legislative provisions have been enacted for this particular chemical, separate from broader temporary measures.

As a leaf node, HTS Code 9902.05.22 does not have further subcategories. Its classification is definitive for 2-Mercaptoethanol when imported under the conditions outlined by the temporary legislation. For classification purposes, it is essential to note that this entry is provided for within subheading 2930.90.91, indicating that while it is classified under a temporary provision, its fundamental chemical classification falls under a more permanent tariff heading.