Eremophilane Sesquiterpene Lactones fromLigularia virgaureassp.oligocephala

From an extract of the whole plant of Ligularia virgaurea ssp. oligocephala, three new eremophilane sesquiterpene lactones, 10α-hydroxy-1-oxoeremophila-7(11),8(9)-dien-12,8-olide (1), 6α,10α-dihydroxy-1-oxoeremophila-7(11),8(9)-dien-12,8-olide (2), 6β,10β-dihydroxyeremophila-7(11),8(9)-dien-12,8-olide (3), as well as four known sesquiterpene lactones with the same carbon skeleton, named toluccanolides A - C (4, 5, 7) and...