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Neopeapyran (1), an unusual furo[2,3b]pyran analogue, together with a new cyclopeptide, turnagainolide C (2), were isolated from Streptomyces sp. S2236 associated with the rhizosphere soil of Panax notoginseng. The planar structure and relative configuration of neopeapyran (1) were elucidated on the basis of spectroscopic techniques, while the absolute configuration was determined by TDDFT calculation...
A new cyclopeptide as well as a known cyclopeptide were isolated from the whole plants of Dianthus caryophyllus. Their structures were elucidated as cyclo (-Thr-Gly-Pro-Tyr-Phe-) (1) and cyclo (-Ala-Gly-Ser-IIe-Phe-Phe-) (2) by means of chemical and spectroscopic methods including MS, 1D and 2D NMR techniques.
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