| 摘要 |
A vitamin D derivative of general formula (1):wherein X represents an oxygen or sulfur atom, R11 represents a saturated or unsaturated aliphatic hydrocarbon group which may be substituted by a hydroxyl group or a protected hydroxyl group, or a -COR12 group where R12 represents an alkyl, aryl or alkoxy group, R2 represents -OR9 or a hydrogen atom, and R9 and R10 each represent a hydrogen atom or a hydroxyl group.
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