[C:1]([O:5][C:6]([NH:8][CH2:9][CH2:10][C:11]([OH:13])=O)=[O:7])([CH3:4])([CH3:3])[CH3:2].CCN=C=NCCCN(C)C.Cl.[C:26]([NH2:30])([CH3:29])([CH3:28])[CH3:27].C(O)(=O)CC(CC(O)=O)(C(O)=O)O>C(Cl)Cl>[C:1]([O:5][C:6](=[O:7])[NH:8][CH2:9][CH2:10][C:11](=[O:13])[NH:30][C:26]([CH3:29])([CH3:28])[CH3:27])([CH3:2])([CH3:3])[CH3:4]A solution of 3-tert-Butoxycarbonylamino-propionic acid (0.5 g, 2.64 mmol) in DCM (5 ml) under an inert atmosphere is treated with 1-hydroxy-7-azabenzatriazole (0.108 g, 0.79 mmol) followed by water soluble carbodiimide (0.491 g, 3.17 mnol) and tert-butylamine (0.305 ml, 2.91 mmol). The reaction mixture is stirred at room temperature for 3 hours and then citric acid (10 ml, 0.5 M) is added to the solution and extracted with DCM (2×10 ml). The combined organic layers are washed with brine (10 ml) and dried over MgSO4. After filtration, the solvent is removed in vacuo to yield the titled compound as an oil.
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