Five New Eremophilane Sesquiterpenes from Ligularia przewalskii

Five new eremophilane‐type sesquiterpenes, 3 β ‐(acetyloxy)‐7‐hydroxynoreremophila‐6,9‐dien‐8‐one ( 1 ), 8 β ‐hydroxy‐2‐dehydroxyliguhodgsonal ( 2 ), 3 β ‐(acetyloxy)‐11‐methoxy‐8‐oxoeremophila‐6,9‐dien‐12‐oic acid ( 3 ), 3 β ‐(acetyloxy)‐11‐(2′‐methylbutanoyloxy)‐8‐oxoeremophila‐6,9‐dien‐12‐oic acid ( 4 ), and 3 β ‐(acetyloxy)‐6 α ‐hydroxyligularenolide ( 5 ), along with the three known compounds 6 – 8 , were isolated from the roots of Ligularia przewalskii. The structures of the new compounds were elucidated through spectral studies including HR‐EI‐MS, IR, and NMR data.