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Pyrrolams A to D (1–4), biosynthetically new pyrrolizidinones produced by Streptomyces olivaceus, have been discovered by chemical screening. Their structures have been determined by spectroscopic methods and by a comparison of (R)‐dihydropyrrolam A (5) with a synthetic sample obtained from (S)‐proline. The pyrrolams differ from the necine bases found in plant‐originating pyrrolizidine alkaloids by their less complicated structures.
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GROTE et al. (1990) studied this question.
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