| 摘要 |
<p>Novel vitamin D3 derivatives which are substituted at the 2-position and epimerized at the 20-position and have -O- or -CH(CH3)- at the 22-position, as represented by general formula (I): wherein X is -O- or -CH(CH3)-; R1 is a C¿1?-C15 saturated or unsaturated aliphatic hydrocarbon group which may be substituted with one to three optionally protected hydroxyl groups; and R?2¿ is lower alkyl.</p> |
