Four new nortriterpenoids, pre-schisanartanins C and D (1–2) with pre-schisanartane backbone, and propintrilactones A and B (3–4) possessed wuweiziartane framework, were isolated from the acetone extract of the stems of Schisandra propinqua var. propinqua. Their structures were characterized by extensive spectroscopic analyses. Compounds 3 and 4 existed as a pair of slowly interconverting diastereomers at room temperature; their absolute configuration was established by CD methods. Compounds 1–4 showed no cytotoxicity against K562, A549, and HT–29 human cancer cells.

中文翻译：

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五味子前素C–D和丙三酸内酯A–B，是五味子五味子中的两类新的降冰片萜类。Propinqua

四个新nortriterpenoids，预schisanartanins C和d（1 - 2）具有预schisanartane骨干，propintrilactones A和B（3 - 4）具有wuweiziartane框架，从丙酮提取物中分离得到的茎五味子园竹变种。propinqua。通过广泛的光谱分析对它们的结构进行了表征。化合物3和4在室温下以一对缓慢互变的非对映异构体形式存在；它们的绝对配置是通过CD方法建立的。化合物1 - 4显示对K562，A549无细胞毒性，和HT-29人癌细胞。