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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.
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Ding et al. (2013) studied this question.
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