2932.20.50 - Other

This HTS category, **2932.20.50 Other**, encompasses lactones (cyclic esters of hydroxy carboxylic acids) that are not specifically classified under preceding subheadings within the lactone group. These compounds are characterized by their heterocyclic structure containing oxygen atoms and are distinct from aromatic lactones, which are categorized separately. The focus here is on non-aromatic lactones that do not fall into more specific defined categories.

The inclusion of "Other" signifies that this subheading serves as a residual category for lactones that do not meet the specific criteria for other enumerated lactones. When classifying an item, one must first exhaust the possibilities of more specific subheadings before considering this broad classification. This ensures that similarly structured compounds are grouped logically based on their chemical makeup and functional groups.

The subcategories within 2932.20.50 provide further specificity for commonly encountered lactones. For instance, **2932.20.50.10 Butyrolactone** and **2932.20.50.20 Glucono-δ-lactone** are distinct chemical entities with specific uses and properties, warranting their separate enumeration. **2932.20.50.30 Sodium erythorbate (Sodium isoascorbate)**, while a salt derivative, is often grouped here due to its close chemical relationship and common industrial applications. The final subheading, **2932.20.50.50 Other**, again acts as a residual for any remaining lactones not otherwise specified.