[CH2:1]([O:8][C:9]([NH:11][CH2:12][CH2:13][C:14]([OH:16])=O)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.Cl.CN(C)CCCN=C=NCC.OC1C2N=NNC=2C=CC=1.C(N(CC)CC)C.[NH2:46][CH2:47][CH:48]([OH:52])[CH:49]([CH3:51])[CH3:50]>ClCCl>[OH:52][CH:48]([CH:49]([CH3:51])[CH3:50])[CH2:47][NH:46][C:14]([CH2:13][CH2:12][NH:11][C:9](=[O:10])[O:8][CH2:1][C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1)=[O:16]46.00 g (206.07 mmol) 3-benzyloxycarbonylamino-propionic acid, 51.37 g (267.95 mmol) 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 27.85 g (206.07 mmol) hydroxybenzotriazole (HOBT) and 37.14 ml (267.95 mmol) triethylamine are placed in 700 ml dichloromethane, the mixture is stirred for 0.5 hours at 0°, then 23.70 g (229.73 mmol) 1-amino-3-methyl-butan-2-ol are added. The reaction mixture is stirred for 16 hours at ambient temperature. Then it is extracted with potassium carbonate solution and dichloromethane. The organic phase is washed with 1 molar sodium hydroxide solution, dried and evaporated to dryness. The residue is extracted with diethyl ether, then recrystallised with acetonitrile.
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