title: Synthesis of the four pairs of side-chain epoxides epimeric at carbon 20 derived from 5-beta-pregnan-3-alpha-ol.
mesh_terms: D001896:Boron Compounds; D001965:Bromides; D055598:Chemical Phenomena; D002621:Chemistry; D004988:Ethers, Cyclic; D010084:Oxidation-Reduction; D010504:Periodic Acid; D011278:Pregnanes
chemical_list: D001896:Boron Compounds; D001965:Bromides; D004988:Ethers, Cyclic; D011278:Pregnanes; D010504:Periodic Acid