methyl 4-amino-3-((R)-3-(4-amino-3,5-dibromo-phenyl)-2-{[4-(2-oxo-1,4-dihydro-2H-quinazolin-3-yl)-piperidin-1-carbonyl]-amino}-propionylamino)-benzoate 以95%的产率得到methyl 2-((R)-2-(4-amino-3,5-dibromo-phenyl)-1-{[4-(2-oxo-1,4-dihydro-2H-quinazolin-3-yl)-piperidin-1-carbonyl]-amino}-ethyl)-1H-benzimidazole-5-carboxylate