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DOI: 10.1055/s-0035-1558331
Antiviral and Cytotoxic Isocoumarin Derivatives from an Endophytic Fungus Aspergillus oryzae
Publication History
received 14 September 2015
revised 03 November 2015
accepted 09 November 2015
Publication Date:
29 January 2016 (online)
Abstract
Oryzaeins A–D (1-4), four new isocoumarin derivatives, along with five known ones (5-9) were isolated from solid cultures of an endophytic fungus Aspergillus oryzae. Their structures were elucidated by detailed spectroscopic analysis and by comparison with reported data of related derivatives. Among them, compounds 1 and 2 represent the first examples of isocoumarins possessing an unusual 2-oxopropyl group and a rare 3-hydroxypropyl group. Compounds 1 and 2 displayed moderate anti-tobacco mosaic virus activities with inhibition rates of 28.4 % and 30.6 %, respectively, at the concentration of 20 µM. The new compounds showed moderate inhibitory activities against several human tumor cell lines with IC50 values in the range of 2.8–8.8 µM.
Supporting information available online at http://www.thieme-connect.de/products
Key words
Aspergillus oryzae - Trichocomaceae - isocoumarin derivatives - anti-tobacco mosaic virus activity - cytotoxicity-
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