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Pseudonectrins A-D, heptaketides from an endophytic fungus Nectria pseudotrichia.
Fu P
,
Zhou T
,
Ren F
,
Zhu S
,
Zhang Y
,
Zhuang W
,
Che Y
.
Abstract
Four new heptaketides, pseudonectrins A-D (1-4), and four known compounds (5-8) were isolated from cultures of an endophytic fungus Nectria pseudotrichia. Their structures were elucidated primarily by NMR experiments. The absolute configurations of 1-3 and 4 were assigned by electronic circular dichroism calculations and the modified Mosher method, respectively. Compound 1-3 showed moderate cytotoxicity, with IC50 values of 11.6-41.2 μM.
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