2937.90.90.00 - Other

This category, HTS 2937.90.90.00, encompasses "other" hormones, prostaglandins, thromboxanes, and leukotrienes, including their synthetic derivatives and structural analogues. This broad classification applies to substances that fall under the general definition of Chapter 29 hormones but do not fit into the more specific sibling categories. These can include a wide range of biologically active compounds, often utilized for their physiological effects, which are not explicitly listed elsewhere within heading 2937.

It is important to distinguish this category from its siblings. HTS 2937.10 covers catecholamine hormones and their derivatives, such as epinephrine and norepinephrine. HTS 2937.20 focuses on steroid hormones, their derivatives, and structural analogues. Therefore, HTS 2937.90.90.00 serves as a residual category for compounds that do not possess the specific chemical structures or functions defined by those more specific headings.

As this is a leaf node, there are no further subcategories. Classification within 2937.90.90.00 will rely on careful analysis to confirm that the substance is indeed a hormone, prostaglandin, thromboxane, or leukotriene, or a synthetic derivative/analogue thereof, and that it does not meet the criteria for any other more precisely defined category within heading 2937. Examples might include certain peptide hormones not falling under chain-modified polypeptides specifically mentioned elsewhere, or complex synthetic compounds designed to mimic the action of naturally occurring prostaglandins.