The Crystal Structure of Biatractylolide, an 8,8′ (C—C) Linked Dimeric 12,8-Eudesmanolide from the Resin of Trattinickia rhoifolia Willd.

A symmetrical dimeric sesquiterpenoid, biatractylolide (1), was isolated from the resin of Trattinickia rhoifolia WILLD. The structure of compound 1 was elucidated by one- and two-dimensional NMR techniques and electron impact-mass spectra (EI-MS) data, and confirmed by X-ray crystallographic analysis.