这个词是什么意思？
A pentacyclic triterpene that occurs widely in many PLANTS as the free acid or the aglycone for many SAPONINS. It is biosynthesized from lupane. It can rearrange to the isomer, ursolic acid, or be oxidized to taraxasterol and amyrin.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D009828 · MeSH 2026。
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