Pregnane
（重定向自Norpregnanes）
![Skeletal formula of pregnane](/Images/godic/202501/30/Pregnane.svg4448.png")
![Ball-and-stick model of the pregnane molecule](/Images/godic/202501/30/Pregnane_3D_ball4448.png")
![Steroid nomenclature: Pregnanes have carbons 1 through 21.](/Images/godic/202501/30/Trimethyl_steroid-nomenclature4448.png")
![Cortisone](/Images/godic/202501/30/Cortisone_structure4448.png")
Pregnane is, 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).
5β-Pregnane is the parent of the progesterones, pregnane alcohols, ketones, and several adrenocortical hormones and is found largely in urine as a metabolic product of 5β-pregnane compounds.