Two new eremophilanolides from Xanthium sibiricum |
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| Authors: | Zhang Xiao-Qi Ye Wen-Cai Jiang Ren-Wang Yin Zhi-Qi Zhao Shou-Xun Mak Thomas C W Yao Xin-Sheng |
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| Institution: | Institute of Traditional Chinese Medicine & Natural Products, Jinan University, Guangzhou 510632, PR China. |
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| Abstract: | Two new eremophilanolides, sibiriolides A (1) and B (2), were isolated from the aerial parts of Xanthium sibiricum. The structures of the new compounds were identified as 4S,5R,7R,8R, 11R-2-oxo-1(10)-eremophilen-12,8-olide (1) and 4S,5R,7R,8R,11S-2-oxo-1(10)-eremophilen-12,8-olide (2) by HREIMS and NMR spectroscopic techniques in combination with X-ray crystallographic analysis and CD measurements. |
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