这个词是什么意思？
Derivative of 7-dehydroxycholesterol formed by ULTRAVIOLET RAYS breaking of the C9-C10 bond. It differs from ERGOCALCIFEROL in having a single bond between C22 and C23 and lacking a methyl group at C24.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D002762 · MeSH 2026。
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