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桦木酸（ｂｅｔｕｌｉｎｉｃａｃｉｄ）是一种五环三萜类化合物，分布于桦木属植物及其它许多属植物中。以植有人类黑色素瘤的无胸腺小鼠作实验对象，发现桦木酸能抑制肿瘤生长，而本身完全没有毒性，它是通过导致细胞的自然死亡而达到抑制作用的。实验证明，桦木酸是氨肽酶Ｎ?
Betulinic acid is a pentacyclic triterpene compound distributed in the birch plants and many other genus plants. Using athymic mice with human melanoma as the experimental subjects, it was found that betulinic acid can inhibit tumor growth and is completely non-toxic by itself, and it is inhibited by causing natural cell death. Experiments show that betulinic acid is aminopeptidase N?