2909.49.05.00 - Guaifenesin

This category encompasses ether-alcohols that do not fall under more specific classifications. Ether-alcohols are compounds containing both an ether functional group (-O-) and a hydroxyl functional group (-OH) attached to an alkyl or aryl radical. The "other" designation signifies that these ether-alcohols are not specifically identified by any preceding HTS subheading. This classification is applied to a broad range of ether-alcohols based on their chemical structure and properties, often serving as intermediates in chemical synthesis or as active ingredients in various formulations.

This subheading is distinguished from its siblings by its broad scope. While other subheadings within Chapter 29 might detail specific types of ether-alcohols or their derivatives (e.g., halogenated, sulfonated), this "Other" category serves as a catch-all for ether-alcohols not otherwise specified. It captures ether-alcohols whose defining characteristic is not a specific modification but rather their fundamental ether-alcohol structure when not separately classified.

As this is a leaf node, there are no further subcategories. Classification at this level hinges on identifying a substance as an ether-alcohol and confirming that it does not meet the criteria for any more specific subheading within the HTS. For instance, guaifenesin, a common expectorant, falls under this specific subheading (2909.49.05.00) as it is an aromatic ether-alcohol that is not otherwise detailed in preceding subheadings.