Pregnane

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What Wikipedia says

Pregnane, also known as 17β-ethylandrostane or as 10β,13β-dimethyl-17β-ethylgonane, is a C21 steroid and, indirectly, a parent of progesterone. It is a parent hydrocarbon for two series of steroids stemming from 5α-pregnane (originally allopregnane) and 5β-pregnane (17β-ethyletiocholane). It has a gonane core.

Excerpt from the Wikipedia article “Pregnane”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Calvero., Public domain, via Wikimedia Commons.