Chemical constituents of Ligularia virgaurea and its diversity in southwestern Sichuan of China

Chemical constituents of root extract and the nucleotide sequences of the atpB–rbcL intergenic region and the internal transcribed spacers (ITSs) of the ribosomal RNA gene were studied for Ligularia virgaurea var. virgaurea collected in southwestern Sichuan Province of China. Eleven samples were collected. Four of them were found to contain four new furanoeremophilanes, virgaurenones A–D, as well as a new eremophilanolide, virgaurenolide A. The...