| Abstract
| - Three novel (1−3) and five known bicyclic 3,8-secotaxane diterpenoids were isolated from the needles ofthe Chinese yew, Taxus chinensis var. mairei. The structures of the new compounds were established,respectively, as (3E,7E)-2α,10β,13α-triacetoxy-5α,20-dihydroxy-3,8-secotaxa-3,7,11-trien-9-one (1), (3E,7E)-2α,10β-diacetoxy-5α,13α,20-trihydroxy-3,8-secotaxa-3,7,11-trien-9-one (2), and (3E,8E)-7β,9,10β,13α,20-pentaacetoxy-3,8-secotaxa-3,8,11-triene-2α,5α-diol (2-deacetyltaxachitriene A) (3), on the basis of spectralanalysis. The other five bicyclic taxane diterpenoids were determined as canadensene, 5-deacetyltaxachitriene B, taxachitriene B, taxuspine U, and taxuspine X by comparison of their physical propertiesand spectral data with those previously reported.
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