Wuhuan triterpenoid compounds Birch acid and its derivatives can be a direct role in tumor cell mitochondria, to change its membrane permeability, the tumor cells induced apoptosis.

• 五环三萜类化合物白桦酸及其衍生物能直接作用肿瘤细胞线粒体，改变其膜渗透性，诱发肿瘤细胞的凋亡。