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Three new indolyl diketopiperazine derivatives, penillines A and B ( 1 and 3 ), isopenilline A ( 2 ), were isolated from the antarctic soil-derived fungus Penicillium sp. SCSIO 05705. A possible biogenesis pathway for compounds ( 1–7 ) was proposed.
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Wang et al. (2015) studied this question.
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