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Three new indole diketopiperazine alkaloids, okaramines S–U (1–3), with two (1 and 2) of them prenylated, were obtained from the Aspergillus taichungensis ZHN-7-07. Their structures including the absolute configurations were determined by combination of NMR, MS, TDDFT ECD calculation, and Marfey's analysis. Okaramine S (1) showed the best cytotoxic activity against HL-60 cell with IC 50 value...
A novel diketopiperazine (DKP) dimer, aspergilazine A (1), dimerized by two DKP units via a rare N-1 to C-6 linkage, was isolated from the marine-derived fungus Aspergillus taichungensis ZHN-7-07. The structure was determined by the combination of spectroscopic and Marfey’s methods. Biological evaluation indicated that aspergilazine A (1) had a weak activity against influenza A (H 1 N ...
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