Two new eremophilane Sesquiterpenoides from Ligularia dictyoneura

Two new eremophilane sesquiterpenoides, 6α,9α-dihydroxyeremophilenolide (1), and 1β,10β-dihydroxyeremophilenolide (2), along with ten known eremophilane sesquiterpenoides (3–12) were isolated from the aerial parts of Ligularia dictyoneura (Franch.) Hand.-Mazz. Their structures were elucidated by means of extensive spectroscopic analysis. Compounds 3–6 were assessed for their cytotoxicity against five human cancer cell lines (HL-60, SMMC-7721,...