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[摘要]：The structures of circumdatins A and B, pentacyclic alkaloids produced by Aspergillus ostianus, were revised from the previously reported betaine structures I (R = MeO, H, resp.) to unique oxepin ones II by X-ray crystallog. The co-occurring known alkaloids, circumdatins D, E, and H, and a new compd. reported here, circumdatin J III, have a common framework. |
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