Two new taxanes from Taxus chinensis var. mairei

Two bicyclic taxanes and two abeotaxanes were isolated from the bark and the needles of the Chinese yew, Taxus chinensis var. mairei. The structures of the two new compounds, 5-( N,N-dimethyl-3'-phenylisoseryl)taxachitriene A and 13-acetyl-9-deacetyl-9-benzoyl-10-debenzoyltaxchinin A, were established by spectral methods.