2937 - Hormones, prostaglandins, thromboxanes and leukotrienes, natural or reproduced by synthesis; derivatives and structural analogues thereof, including chain modified polypeptides, used primarily as hormones:
Sub-classifications
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2937 1200 00
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2937 1900 00
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2937 2100
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2937 2100 10
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2937 2100 20
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2937 2100 30
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2937 2100 40
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-
2937 2200 00
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2937 23
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2937 2310 10
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2937 2310 20
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2937 2310 50
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-
-
-
2937 2350
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2937 2350 10
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-
2937 2350 20
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2937 2350 50
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-
-
-
2937 29
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2937 2910 00
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2937 2990
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2937 2990 20
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2937 2990 30
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2937 2990 40
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2937 2990 50
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2937 2990 95
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-
-
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2937 90
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2937 9005 00
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2937 9010 00
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2937 9020 00
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-
-
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2937 9040 00
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2937 9045 00
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2937 9090 00
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Overview
Chapter 2937 of the Harmonized Tariff Schedule (HTS) encompasses a specific group of organic chemicals that play crucial roles in biological regulation: hormones, prostaglandins, thromboxanes, and leukotrienes. This category includes both naturally occurring compounds and those produced through synthetic processes. Importantly, it also covers derivatives and structural analogues of these substances, including modified polypeptides, provided their primary function is hormonal. This classification is designed to group together substances that, while chemically diverse, share a common pharmacological purpose.
Distinguishing this chapter from its sibling categories within the HTS highlights its specialized nature. Unlike broad categories covering live animals (Chapter 01) or various other classes of organic chemicals in Chapter 29, 2937 is focused exclusively on biologically active signaling molecules. While other chemical chapters might list precursors or metabolites, 2937 specifically targets the active hormonal agents and their closely related synthetic counterparts.
Within Chapter 2937, further subdivisions clarify the classification of these complex molecules. These subcategories often differentiate based on the chemical structure and origin of the hormonal substances, such as polypeptide/protein/glycoprotein hormones versus steroidal hormones. A dedicated subheading addresses prostaglandins, thromboxanes, and leukotrienes, recognizing their distinct but related biological functions. Finally, a catch-all category exists for "Other" hormones and their derivatives, ensuring comprehensive coverage for related substances not explicitly enumerated in the more specific subheadings.