The Asclepiadaceae plant is a rich source of C₂₁ steroidal glycosides. The present study aimed to investigate the C₂₁ steroidal glycosides from the whole plants of Tylophora atrofolliculata (Asclepiadaceae). As a result, three new C₂₁ steroidal glycosides named atrofollicosides A-C (1-3) and four known steroidal glycosides (4-7) were isolated. The structures of these compounds were characterized using NMR spectroscopy. Highlighted here is a new disecopregnane-type steroid with a hydroxyl group at the C-18 position that constitutes the aglycone of compound 1.

中文翻译：

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Tylophora atrofolliculata中的三种新的C ₂₁类固醇糖苷

萝摩科植物富含C ₂₁甾体糖苷。本研究的目的是研究全脂铁线虫（Asylpiadaceae）全植物中的C ₂₁类固醇糖苷。其结果是，三个新Ç ₂₁命名atrofollicosides AC甾体糖苷（1 - 3）和四个已知的甾体糖苷（4 - 7中分离）。这些化合物的结构使用NMR光谱法表征。这里重点介绍的是一种新的二十四碳烷类固醇，在C-18位置带有一个羟基，构成化合物1的糖苷配基。