Celogentin K, a new cyclic peptide from the seeds of Celosia argentea and X-ray structure of moroidin

Tetrahedron
2004.0

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.

DOI： 10.1016/J.TET.2004.01.053

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