这个词是什么意思？
An alkaloid isolated from the stem wood of the Chinese tree, Camptotheca acuminata. This compound selectively inhibits the nuclear enzyme DNA TOPOISOMERASES, TYPE I. Several semisynthetic analogs of camptothecin have demonstrated antitumor activity.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D002166 · MeSH 2026。
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