Napifera A-F, six previously undescribed sesquiterpenoid derivatives from the roots of Crepis napifera.
Phytochemical investigation of the roots of Crepis napifera yielded six previously undescribed sesquiterpenoid derivatives, napifera A-F (1-5 and 16), together with 23 known compounds, which expand the known structural diversity of sesquiterpenoids from C. napifera.