Two new diterpenoid alkaloids and eight known ones were isolated from the root of Aconitum leucostomum. Their structures were elucidated on the basis of extensive spectroscopic analyses such as HR-ESI-MS, 1D NMR and 2D NMR spectra. Compounds 1, 2, 5, 6 and 8 were tested for their antifeedant activity against Spodoptera exigua Hübner, and compound 2 showed antifeedant activity with an effective concentration for 50% feeding reduction (EC50) at 1.54 mg/cm2.

中文翻译：

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二萜生物碱来自

从白头乌头根中分离得到2个新的二萜生物碱和8个已知的生物碱。在广泛的光谱分析如 HR-ESI-MS、1D NMR 和 2D NMR 光谱的基础上阐明了它们的结构。化合物1 ，2 ，5 ，6和8为它们对拒食活性进行了测试甜菜夜蛾棉铃虫，和化合物2显示出拒食活性，其有效浓度馈送减少50％（EC 50在1.54毫克/平方厘米）2 。