Xanthone, benzophenone and bianthrone derivatives from the hypersaline lake-derived fungus Aspergillus wentii
Abstract
Five new metabolites, including the xanthone derivative wentixanthone A (1), the benzophenone wentiphenone A (2), the diastereomeric mixtures of the bianthrones wentibianthrone A (3a, b) and wentibianthrone B (4a, b), as well as (10R,10'S)-wentibianthrone C (5a) and (10R,10'R)-wentibianthrone C (5b) were obtained from the fungus Aspergillus wentii, isolated from soil of the hypersaline lake El Hamra in Wadi El-Natrun, Egypt. The structures of the isolated compounds were established by one and two-dimensional NMR and MS spectroscopic analysis. The relative configuration of bianthrones (3-5) was elucidated by comparison of experimental and computed 1H NMR chemical shifts. Results of biological assays are reported.
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