allopregnane
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Pregnane — IUPAC name (8S,9S,10S,13R,14S,17S) 17 ethyl 10,13 dimethyl 2,3,4,5,6,7,8,9,11,12, 14,15,1 … Wikipedia
pregnane — Parent hydrocarbon of two series of steroids stemming from 5α p. (originally allopregnane) and 5β p. (17β ethyletiocholane). 5β P. is the parent of the progesterones, p. alcohols, ketones, and several adrenocortical hormones and is found largely… … Medical dictionary