Abstract
A novel bicyclic taxane diterpene with a rare 12-membered ring was isolated from needles of the Chinese yew, Taxus mairei, and its structure was established as (3E, 8E)-2 alpha, 7 beta, 9, 10 beta, 13 alpha, 20-hexaacetoxy-5(2'-acetoxy-cinnamoyloxy)-3,8-secotaxa -3,8,11-triene (1) with the help of 1D and 2D NMR data. The relative stereochemistry was deduced from a NOESY experiment.
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