Secondary metabolites from the endophytic fungi<i>Penicillium polonicum</i>and<i>Aspergillus fumigatus</i>

Abstract

Two new compounds, rhodostegone (1) from endophytic fungus Penicillium polonicum and cyclo-(l-Val-l-Leu) (2) from Aspergillus fumigatus, together with six known diketopiperazines (3-8), were isolated. The structures of these compounds were characterized through a combination of extensive IR, MS, NMR, and CD analysis.