这个词是什么意思？
Heterocyclic rings containing three nitrogen atoms, commonly in 1,2,4 or 1,3,5 or 2,4,6 formats. Some are used as HERBICIDES.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D014227 · MeSH 2026。
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