Abstract
Three new diterpenes, taxamairin A (1), taxamairin B (2) and taxamairin C (3), were isolated from the bark of Taxus mairei (Lemee et levl.) S. Y. Hu collected in Fujian Province, China. Compounds 1 and 2 are tricyclic diterpenes containing a tropone ring system, while compound 3 is a tetracyclic diterpene bearing a hemiketal moiety. Their structures were elucidated on the basis of high resolution 1H NMR, 13C NMR, NOE and COSY. The structure of 1 has also been confirmed by X-ray diffraction.
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