A New Triterpene and New Sesquiterpenes from the Roots of Ligularia sagitta

One new triterpene and seven new eremophilane‐type sesquiterpenes were isolated from the roots of Ligularia sagitta, among them 1a, an O‐acetylated oleanane type triterpene, 2a and 3a, two 11‐nor eremophilane‐type sesquiterpenes, 4a, 5, and 6, three standard eremophilane‐type sesquiterpenes, and 7 and 8, two tri‐nor eremophilane‐type sesquiterpenes. Their structures were established by extensive spectral analyses (1D, 2D‐NMR, IR, and MS). Compound 1a showed moderate cytotoxicity against two tumor cell lines.