Liu Ting-Ting, Wu Hai-Bo, Wang Wen-Shu
College of Life and Environment Science, Minzu University of China, Beijing 100081, People's Republic of China.
Acta Crystallogr Sect E Struct Rep Online. 2012 Nov 1;68(Pt 11):o3251. doi: 10.1107/S160053681204425X. Epub 2012 Oct 31.
The title compound, C(15)H(20)O(4), is a eudesmanolide isolated from the Chinese medicinal plant Carpesium tris-te Maxim. The mol-ecule contains three rings, viz. two fused six-membered rings in chair conformations and a five-membered ring in a flattened envelope conformation. In the crystal, two hy-droxy groups are involved in the formation of intra- and inter-molecular O-H⋯O hydrogen bonds. The H atoms in these groups are split, with site-occupation factors of 0.5. The inter-molecular hydrogen bonds link mol-ecules into chains propagating in [010].
标题化合物C(15)H(20)O(4)是从中国药用植物三轮蒿（Carpesium tris-te Maxim）中分离得到的一种桉叶烷型倍半萜内酯。该分子含有三个环，即两个呈椅式构象的稠合六元环和一个呈扁平信封式构象的五元环。在晶体中，两个羟基参与形成分子内和分子间的O-H⋯O氢键。这些基团中的H原子发生分裂，占位因子为0.5。分子间氢键将分子连接成沿[010]方向延伸的链。
