来自没药树的（20S）-20-乙酰氧基-4-孕烯-3,16-二酮。
(20S)-20-Acet-oxy-4-pregnene-3,16-dione from Commiphora wightii.
作者信息
Yousuf Sammer, Ahmed Rida, Ali Zulfiqar, Choudhary M Iqbal, Ng Seik Weng
出版信息
Acta Crystallogr Sect E Struct Rep Online. 2010 Nov 27;66(Pt 12):o3301. doi: 10.1107/S1600536810047987.
Abstract
The title triterpene compound, C(23)H(32)O(4), isolated from Commiphora wightii features four trans-fused rings, among which the five-membered ring adopts an envelope conformation, the cyclo-hexene ring adopts a half-chair conformation and the two cyclo-hexane rings exist in chair conformations. The asymmetric unit contains two independent mol-ecules. Weak inter-molecular C-H⋯O hydrogen bonding is present in the crystal structure.
摘要
从没药中分离出的标题三萜化合物C(23)H(32)O(4)具有四个反式稠合环，其中五元环呈信封构象，环己烯环呈半椅构象，两个环己烷环呈椅式构象。不对称单元包含两个独立分子。晶体结构中存在弱的分子间C-H⋯O氢键。
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