Two new taxane diterpenoids from the seeds of the Chinese yew, Taxus yunnanensis.

A new taxoid and a taxinine analogue were isolated from the seeds of the Chinese yew, Taxus yunnanensis. The structures were established as 13 alpha-acetoxy-5 alpha-(3'-dimethylamino-3'-phenyl)-propionyloxy-11(15-->1)-abeotaxa- 4(20),11-diene-9 alpha, 10 beta-diol and 2 alpha-acetoxy-5 alpha-cinnamoyloxy-9 alpha, 10 beta-dihydroxy-taxa- 4(20),11-diene-13-one on the basis of 1D, 2D NMR, and MS spectral analysis.