A new ent-pimarane glucoside, named hythiemoside B (4), was isolated from the aerial part of Siegesbecikia orientalis L. (Asteraceae) together with four known ent-pimarane-type diterpenoids: darutigenol (1), darutoside (2), hythiemoside A (3), and ent-(15R),16,19-trihydroxypimar-8(14)-ene 19-O-beta-D-glucopyranoside (5). The structure of the new compound was elucidated by spectroscopic analyses and chemical transformation. The NMR data of compounds 1 (1H-) and 5 (1H- and 13C-) were also compiled in this study on the basis of 2D experiments.

中文翻译：

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东方Siegesbeckia Orientalis L.的ent-pimarane型二萜。

从东方侧柏（Siegesbecikia Orientalis L.（Asteraceae））的空中部分分离出一种新的新海马烷葡糖苷，命名为Hythiemoside B（4），以及四种已知的新海马烷型二萜类化合物：darutigenol（1），darutoside（2），Hythiemoside A（3）和ent-（15R），16,19-trihydroxypimar-8（14）-ene19-O-β-D-吡喃葡萄糖苷（5）。通过光谱分析和化学转化来阐明新化合物的结构。在2D实验的基础上，本研究还汇总了化合物1（1H-）和5（1H-和13C-）的NMR数据。