Cystinyl-bis-glycine

Cystinyl-bis-glycine is a dipeptide intermediate in the synthesis of oxidized glutathione that is composed of two cysteinylglycine peptides linked by a disulfide bond.{53721} It is formed via nonenzymatic oxidation of cysteinylglycine, a glutathione catabolite produced by y-glutamyl transpeptidase.{53721,53722}