Two New Eudesmanolides from the Flowers of Achillea millefolium.

Two new eudesmanolides, 3β-acetoxy-1β,4α-dihydroxy-11αH-eudesman-12,6α-olide (1) and 3β-acetoxy-1β-hydroxy-11αH-eudesman-4(15)-en-12,6α-olide (2), were isolated from the flowers of Achillea millefolium, their structures were established on the basis of spectral analysis.