Betulinic acids are a kind of natural product with anti-HIV-1 virus and anti-tumor activity extractable from a lot of plants.They include betulinic acid,23-hydroxy betulinic acid, betulin, and others.

• 白桦酸类化合物是一类可以从多种植物中分离得到的天然产物,包括白桦酸、23-羟基白桦酸、白桦素及其衍生物等,是一类结构及作用机制相对新颖、具有抗HIV-1和抗肿瘤活性的天然化合物。