Zhang Zhan-Xin, Fei Dong-Qing
School of Pharmacy, Lanzhou University, Lanzhou 730000, People's Republic of China.
Acta Crystallogr Sect E Struct Rep Online. 2011 Nov;67(Pt 11):o2957. doi: 10.1107/S160053681104150X. Epub 2011 Oct 12.
The title compound, C(15)H(22)O(4), an eremophilane sesquiternoid, was isolated from the roots of Ligularia virgaurea. Both six-membered rings (A and B) adopt chair conformations and the five-membered ring is almost planar (r.m.s. deviation = 0.016 Å). The two methyl and two hy-droxy groups adopt a syn conformation and the A/B ring junction is cis-fused. An intra-molecular O-H⋯O hydrogen bond generates an S(6) ring. In the crystal, O-H⋯O hydrogen bonds link the mol-ecules into [100] chains.
标题化合物C(15)H(22)O(4)，一种苦艾烷倍半萜，从黄帚橐吾的根中分离得到。两个六元环（A环和B环）均呈椅式构象，五元环几乎呈平面状（均方根偏差 = 0.016 Å）。两个甲基和两个羟基呈顺式构象，A/B环稠合为顺式。分子内O—H⋯O氢键形成一个S(6)环。在晶体中，O—H⋯O氢键将分子连接成[100]链。
