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Pregnane, also known as 17β-ethylandrostane or as 10β,13β-dimethyl-17β-ethylgonane, is a C21 steroid and, indirectly, a parent structure 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.
5β-Pregnane is the parent of , , and , and is found largely in urine as a metabolism product of 5β-pregnane compounds.
Most biologically significant pregnane derivatives fall into one of two groups: and . Another class is .
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