美登木属植物Maytenus chuchuhuasca民间用其醇液治疗皮肤癌。作者将其树皮粉末100克用已烷-乙酸乙酯(1:1)混合物室温提取,提取液蒸干得残留物2.5克,在薄层层析上用苯-乙酸乙酯(9:1)展开,呈现两个橙色色素,经硅胶层析分得250毫克(1)和200毫克(2),与已知样品的TLC、IR及NMR作比较,证明(1)和(2)分别为pristimerin及染用卫矛酮(Tingenone)属于酚二烯酮三萜类化 Maytenus chuchuhuasca is a folk medicine used to treat skin cancer with its alcoholic solution. The author of the bark powder 100 grams with hexane - ethyl acetate (1: 1) mixture was extracted at room temperature, the extract was evaporated to give a residue of 2.5 g, thin layer chromatography with benzene - ethyl acetate (9: 1 ). Two orange pigments were visualized, and 250 mg (1) and 200 mg (2) were separated by silica gel chromatography. Compared with TLC, IR and NMR of known samples, it was proved that (1) and Prismtimerin and Tingenone belong to the class of the tiene terpenes