五环的
Japan selected 75 # high-carbon stainless steel, high hardness pentacyclic spring as a strong core. 选定日本75%23高碳精钢，五环高硬度的弹簧作为坚强核心。
This review presents the progress in the biotransformation of pentacyclic triterpenes from 1996-2006. 本文综述了1996年到2006年五环三萜类化合物的微生物转化研究。
Typical markers are the porphyrins, pristine, phytane, steranes, carotenes and pentacyclic triterpanes. 典型的标志如卟啉、姥鲛烷、植烷、留烷、胡萝卜烷、以及五环三萜烷。
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。
