2937.50.00.00 - Prostaglandins, thromboxanes and leukotrienes, their derivatives and structural analogues

This HTS category, 2937.50, specifically covers prostaglandins, thromboxanes, and leukotrienes, along with their derivatives and structural analogues. These are potent lipid compounds derived from fatty acids, playing crucial roles in a wide range of physiological processes within the body, including inflammation, blood clotting, and reproduction. Their applications are often pharmaceutical, utilized in medications for conditions such as glaucoma, gastric ulcers, and labor induction. Classification within this heading is based on the molecular structure being identifiable as a prostaglandin, thromboxane, or leukotriene, or a direct modification thereof.

Distinguishing this category from its sibling, 2937.90 ("Other"), is straightforward. While 2937.90 acts as a residual category for hormones and related compounds not otherwise specified, 2937.50 is dedicated to the specific chemical classes of prostaglandins, thromboxanes, and leukotrienes. It is also distinct from other sibling categories which focus on polypeptide, protein, glycoprotein, or steroidal hormones, or glycosides and alkaloids. The key differentiator lies in the distinct chemical nature and physiological function of prostaglandins, thromboxanes, and leukotrienes compared to these other broad classes of biologically active compounds.

As this is a leaf node within the HTS, there are no further subcategories to introduce. Therefore, classification within 2937.50 relies on accurately identifying the goods as prostaglandins, thromboxanes, leukotrienes, or their structural modifications, often requiring detailed chemical analysis or specific product documentation to confirm their identity and ensure correct customs processing.