STUDIES ON THE SOLANACEOUS PLANTS .26. CYCLIC-PEPTIDES, ACYCLIC DITERPENE GLYCOSIDES AND OTHER COMPOUNDS FROM LYCIUM-CHINENSE MILL

The chemical structures of four cyclic peptides, lyciumins A-D (1-4), three acyclic diterpene glycosides, lyciumosides I-III (5-7) and other three compounds, a tryptophan derivative glycoside (8), a monoterpene glycoside (9) and a steroidal glycoside (10) isolated from Lycium chinense, have been elucidated by a combination of chemical, H-1- and C-13-NMR, and mass spectrometric studies. Lyciumins are interesting because of their monocyclic octapeptides containing a novel C-N linkage between tryprophan N1 and glycine C(alpha).