A novel taxane diterpenoid with a rearranged 5/7/6-membered ring system was isolated from seeds of the Chinese yew, Taxus yunnanensis. Its structure was established as 9α,13α-diacetoxy-10β-benzoxy-5α-cinnamoyl-11(15→1)-abeotaxa-4(20),11-dien-15-ol on the basis of a spectroscopic analysis. Its relative stereochemistry is proposed from the results of NOESY experiments.
