protopine alkaloid

例句：

1. 1. The plant extract contains high levels of protopine alkaloids, which are known to have anti-cancer properties.
   这种植物提取物含有高水平的原儿茶碱，已知具有抗癌性质。
2. 2. Researchers found that protopine alkaloids could be used as an alternative treatment for Alzheimer's disease.
   研究人员发现原儿茶碱可以作为治疗阿尔茨海默病的替代疗法。
3. 3. Protopine alkaloids have been shown to have potential applications in the field of pharmacology.
   已显示原儿茶碱在药理学领域有潜在应用。