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Novel antilipid peroxidative carbazole alkaloids, antiostatin A 5 ( 1 ), antiostatin A 6 ( 2 ), and (±)-morindolestatin ( 3 ), were isolated from a new soil-derived Streptomyces sp. Compound 2 possesses an unusual cyclohexene side chain. Compound 3 was a pair of enantiomers featuring an unprecedented [1,4]oxazino[2,3- c ]carbazole ring system. The absolute configuration of 3 was determined by online HPLC-ECD and ECD calculation. A racemization mechanism and putative biosynthetic pathway are discussed.
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Zhang et al. (2020) studied this question.
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