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A novel cytotoxic cyclic heptapeptide, yunnanin C (1), was isolated from the roots of Stellaria yunnanensis. The structure of 1, cyclo(-Gly-Ile-Gly-Phe-Tyr-Ser-Pro-), was elucidated from spectroscopic evidence and by chemical degradation.

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Two novel cyclic peptides, named yunnanins A and B, have been isolated from Stellaria yunnanensis (Caryophyllaceae) and their structures were elucidated by spectroscopic evidence and chemical degradation.