Cyclic peptide and peptide alkaloids from seeds of Zizyphus vulgaris

Abstract

From seeds of Zizyphus vulgaris var. spinosus a new cyclic peptide, sanjoinenine, four new peptide alkaloids (sanjoinine-B, -D, -F and -G2), together with the known cyclic peptide alkaloids, frangufoline and amphibine-D have been isolated. The structures of the compounds were established by chemical and spectral methods.