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Pregnane

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 and 5β-pregnane (17β-ethyletiocholane). It has a gonane core.

Pregnanes
nomenclature: Pregnanes have carbons 1 through 21. Pregnanes are steroid derivatives with carbons present at positions 1 through 21. Most biologically significant pregnane derivatives fall into one of two groups: pregnenes and pregnadienes. Another class is pregnatrienes. ==Pregnenes==
Pregnenes
Pregnenes have a double bond. Examples include: • CortisoneHydrocortisoneProgesterone ==Pregnadienes==
Pregnadienes
Pregnadienes have two double bonds. Examples include: • Cyproterone acetateDanazolFluocinonide ==See also==
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