这个词是什么意思？
A narcotic antagonist with some agonist properties. It is an antagonist at mu opioid receptors and an agonist at kappa opioid receptors. Given alone it produces a broad spectrum of unpleasant effects and it is considered to be clinically obsolete.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D009269 · MeSH 2026。
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