2937.11.00.00 - Somatotropin, its derivatives and structural analogues

This HTS category, 2937.11.00.00, specifically covers somatotropin, which is also known as growth hormone. It encompasses not only the naturally occurring or synthetically produced forms of somatotropin but also any derivatives and structural analogues. These substances are characterized by their polypeptide structure and their primary function as hormones that stimulate growth and cell reproduction. The classification is intended for active pharmaceutical ingredients and their immediate precursors, not for finished pharmaceutical products or formulations containing these hormones.

This classification is distinct from its sibling categories. Category 2937.12.00.00 covers insulin and its salts, which, while also polypeptide hormones, have a different physiological role in regulating blood glucose. The "Other" category, 2937.19.00.00, is a residual classification for polypeptide hormones, protein hormones, and glycoprotein hormones, their derivatives, and structural analogues that do not fall under the specific provisions for somatotropin or insulin. Therefore, the key distinguishing factor for 2937.11.00.00 is the chemical identity and primary hormonal action related to growth.

As this is a leaf node in the HTS, there are no further subcategories. Classification under 2937.11.00.00 is determined by the precise chemical identification of the substance as somatotropin or a direct derivative or structural analogue thereof, and its intended use as a hormone. This means that the focus for classification purposes rests on the molecular structure and the inherent biological activity of the imported material.