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An unprecedented 4,9‐seco‐oplopanane (1), two undescribed drimane epimers (2 and 3), and five known drimane sesquiterpenoids (4–8) were isolated from the Chinese liverwort Lejeunea flava (Sw.) Nees. The structures of the new sesquiterpenoids were determined using nuclear magnetic resonance spectroscopy, electronic circular dichroism calculations, and single‐crystal X‐ray diffraction measurements....
Six new sesquiterpenoids, named as ainslides A−F (1–6), including one carotene‐type sesquiterpene (1), one eudesmane (2), four guaianolides (3–6), together with eight known sesquiterpenoids (7–14), were purified from the whole plants of Ainsliaea pertyoides. The structures of these sesquiterpenoids were characterized based on spectroscopic methods including 1D and 2D NMR, HR‐ESI‐MS, UV, and IR spectra,...