2937.29 - Other:

Category 2937.29 encompasses steroidal hormones, their derivatives, and structural analogues, excluding those specifically enumerated in the preceding subheadings. This category serves as a residual classification for steroidal compounds used primarily as hormones that do not fall under the more precisely defined categories for adrenal cortical hormones (both halogenated and non-halogenated), estrogens, or progestins. The key distinguishing factor for items within this classification is their steroidal structure and their primary hormonal function, when they are not otherwise specifically listed.

This category differentiates itself from its siblings by its broad residual nature. For instance, while 2937.21 covers specific well-known adrenal cortical hormones like cortisone and prednisone, and 2937.22 addresses their halogenated counterparts, 2937.29 captures other steroidal hormones. Similarly, it is distinct from 2937.23, which is dedicated to estrogens and progestins, by covering steroidal hormones of different physiological classes or functions.

Within this category, further distinctions are made. Subheading 2937.29.10 specifically lists desonide and nandrolone phenpropionate, providing concrete examples of items classified here. All other steroidal hormones and their derivatives that do not fit the specific examples or the sibling categories are directed to the residual subheading 2937.29.90, "Other." This hierarchical structure ensures that all steroidal hormones, derivatives, and analogues are appropriately classified within Chapter 29.