（２０Ｓ）−２−メチレン−１９−ノル−２２−ジメチル−１α，２５−ジヒドロキシビタミンＤ３および（２０Ｒ）−２−メチレン−１９−ノル−２２−ジメチル−１α，２５−ヒドロキシビタミンＤ３

摘要

Compounds of formula I are provided where X1, X2 and X3 are independently selected from H or hydroxy protecting groups. Such compounds may be used in preparing pharmaceutical compositions and are useful in treating a variety of biological conditions.