Two new taxane diterpenes, dantaxusin A [5 alpha -cinnamoyloxy-2 alpha ,7 b
eta ,13 alpha -triacetoxy-2(3 --> 20)abeo-taxa4(20),11-diene-9,10-dione (1)
] and dantaxusin B [5 alpha -cinnamoyloxy-9 alpha -hydroxy-10 beta ,13 alph
a -diacetoxytaxa-4(20),11-diene (2)], were isolated from an ethanol extract
of the aerial parts of Taxus yunnanensis along with taxuspine B, 2-deaceto
xytaxinine J, taxuyunnanine C, taxinine B, taxuspine C, and taxinine NN-4.
The structures of 1 and 2 were established on the basis of 1D and 2D NMR an
d HRMS spectroscopic methods.