Enzymatic Desymmetrization of 19‐nor‐Vitamin D3 A‐Ring Synthon Precursor: Synthesis, Structure Elucidation, and Biological Activity of 1α,25‐Dihydroxy‐3‐epi‐19‐nor‐vitamin D3 and 1β,25‐Dihydroxy‐19‐nor‐vitamin D3 | Publicación