1-Hydroxybaccatin I, C₃₂H₄₄O₁₄, and 2-Deacetoxydecinnamoyltaxinine J, C₂₈H₄₀O₉

The title compounds are diterpenoids isolated from the Himalayan yew (Taxus wallichiana Zucc.). The crystal structures allow us to rationalize some peculiar features of the NMR data of the taxane 4(20)-epoxides. Conformational differences between epoxide, olefin-type and oxetane-type compounds like paclitaxel are summarized.

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