It has been reported elsewhere that Vigna radiata seeds contain a high concentration of γ-glutamyl-S-methylcysteine and its sulphoxide and that these compounds serve as index compounds for the chemotaxonomy of V. radiata. Beside these two γ-glutamyl peptides, nine other γ-glutamyl derivatives, of which three are new compounds, have been isolated and identified from V. radiata seeds. The structures of the new peptides, γ-glutamyl-S-methylcysteinyl-β-alanine (S-methylhomoglutathione), γ-glutamyl-Nδ-acetylornithine and γ-glutamyl-γ-glutamyl-S-methylcysteine, were confirmed by direct comparison with synthetic specimens. The other six γ-glutamyl derivatives were homoglutathione, γ-glutamyl glutamic acid, -aspartic acid, -phenylalanine, -leucine and -isoleucine.