这个词是什么意思？
The active insecticidal constituent of CHRYSANTHEMUM CINERARIIFOLIUM flowers. Pyrethrin I is the pyretholone ester of chrysanthemummonocarboxylic acid and pyrethrin II is the pyretholone ester of chrysanthemumdicarboxylic acid monomethyl ester.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D011722 · MeSH 2026。
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