Two new caryophyllene sesquiterpenes have been isolated from Pestalotiopsis sp., an endophytic fungus associated with the bark and leaves of Taxus brevifolia . Pestalotiopsin A ( 1 ) has a novel oxatricyclic ring system while pestalotiopsin B ( 3 ) exists as two slowly equilibrating atropisomers (6:5 ratio of ββ:βα) in chloroform solution at room temperature. Structures of 1 and 3 were determined by spectroscopic analyses and single-crystal X-ray diffraction.
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Pulici et al. (1996) studied this question.
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