pentacyclic triterpenoids的用法和样例：
例句
- This article is reviewing the structure-ac-tivity relationship of pentacyclic triterpenes.
笔者讨论了一些五环三萜类化合物的药理活性与结构的关系。 - Maslinic or crataegolic acid is a pentacyclic terpene with antioxidant and anticancer effects found in wax from olie skin, alongside oleanolic acid.
山楂酸是从橄榄皮中的蜡状物中提取出来的，属于五环三萜类，具有抗氧化性及抗癌活性。
