Novel vitamin D.sub.3 derivative and process for preparing the same
申请人:Yamada; Sachiko
公开号:US04284577A1
公开(公告)日:1981-08-18
A novel vitamin D.sub.3 derivative of the formula ##STR1## (wherein R.sub.1 is hydrogen or a hydroxyl group) which exhibits strong biological activity like that of vitamin D and is useful as a medicine; and a process for producing the same are disclosed.