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  • Title: Two new eremophilanolides from Xanthium sibiricum.
    Author: Zhang XQ, Ye WC, Jiang RW, Yin ZQ, Zhao SX, Mak TC, Yao XS.
    Journal: Nat Prod Res; 2006 Nov; 20(13):1265-70. PubMed ID: 17127520.
    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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