Celogentin K, a new cyclic peptide from the seeds of Celosia argentea and X-ray structure of moroidin |
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| Authors: | Hayato Suzuki Motoo Shiro |
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| Institution: | a Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan
b X-ray Research Laboratory, Rigaku Corporation, Akishima, Tokyo 196-8666, Japan |
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| Abstract: | A new cyclic peptide with a 3-hydroxyoxindole ring, celogentin K (1), has been isolated from the seeds of Celosia argentea and the structure including its absolute stereochemistry was assigned by using extensive NMR, MS/MS, and CD spectra. The stereostructure of a known related bicyclic peptide, moroidin (2), was confirmed by a single crystal X-ray diffraction analysis. |
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| Keywords: | Cyclic peptide Celogentin K Moroidin NMR MS/MS CD X-ray |
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