Abstract
Neosartoryadins A (1) and B (2), both with a unique 6/6/6/5 quinazoline ring system connected directly to a 6/5/5 imidazoindolone ring, together with three biogenetically related compounds 3-5, were isolated from the endophytic fungus Neosartorya udagawae HDN13-313. The absolute configurations of new compounds 1-4 were established. Compounds 1 and 2 displayed anti-influenza virus A (H1N1) activities with IC50 values of 66 and 58 μM, respectively (ribavirin as positive control, IC50 = 94 μM).
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