[NH2:1][C@H:2]([C:7]([OH:9])=O)[CH2:3][CH:4]([CH3:6])[CH3:5].[NH2:10][C@H:11]([C:19]([OH:21])=[O:20])[CH2:12][C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1.[CH3:22][Si](Cl)(C)C>CO>[CH3:22][O:20][C:19](=[O:21])[C@H:11]([CH2:12][C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)[NH:10][C:7](=[O:9])[C@H:2]([CH2:3][CH:4]([CH3:6])[CH3:5])[NH2:1]The title compound is prepared by the procedure of Example 7 using 0.50 g of L-leucine-L-phenylalanine, 10 ml of methyl alcohol and 0.536 ml of trimethylsilyl chloride to give 0.53 g of the desired product.
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