Synthesis of (Glu-OMe)2-litorin

The synthesis of the nonapeptide less than Glu-Glu(OMe)-Trp-Ala-Val-Gly-His-Phe-Met-NH2, corresponding to the formula of the (Glu-OMe)2-litorin, is described. The compound has the same chemical and biological properties of the second bombesin like peptide extracted from the skin of the Australian frog Litoria aurea.