K. Gao et al., BISABOLANE SESQUITERPENES FROM LIGULARIA-DENTATA, Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 36(8), 1997, pp. 715-718
Two new sesquiterpenes have been isolated from the roots of Ligularia
dentata, and their structures established by spectroscopic methods and
2D-NMR techniques as ligudentatone A 1 and ligudentatone B 2.