Described are novel compounds of the formula (IV)
wherein R1 is a hydrogen atom, a nyaroxyl group or a protected hydroxyl group and R2 is a hydrogen atom or a protecting group,
a pharmaceutical composition useful as a cell differentiation-inducing agent, which contains an effective amount of a compound of the formula IV (wherein R2 is H) as an active ingredient and a pharmaceutically acceptable carrier or diluent,
a method of inducing cell differentiation by administering an effectiveamount of a compound of the formula IV (wherein R2 is H to a patient,
and a proceesfor producing a compound of the formula (IV) by subjecting a previtamin D3 derivative of the formula (III)
wherein R1 and R2 are as defined above, to thermal isomerization to yield a vitamin D3 derivative of the formula (IV) mentioned above.
所述的是式(IV)的新型化合物
其中 R1 是氢原子、尼龙基团或保护羟基,R2 是氢原子或保护基团、
一种可用作细胞分化诱导剂的药物组合物,它含有有效量的式(IV)化合物(其中 R2 为 H)作为活性成分和药学上可接受的载体或稀释剂、
一种通过向患者施用有效量的式 IV(其中 R2 为 H)化合物来诱导细胞分化的方法、
以及一种通过使式(III)的前
维生素D3衍
生物受体而制备式(IV)化合物的方法
其中 R1 和 R2 如上文所定义,进行热异构化以产生上述式(IV)的
维生素 D3 衍
生物。