C([O:8][C:9](=[O:34])[C@@H:10]1[CH2:14][CH2:13][CH2:12][N:11]1[C:15](=[O:33])[C@@H:16]1[CH2:20][CH2:19][CH2:18][N:17]1[C:21](=[O:32])[C@H:22]([CH3:31])[NH:23][C:24]([O:26][C:27]([CH3:30])([CH3:29])[CH3:28])=[O:25])C1C=CC=CC=1.[H][H]>CO.[C].[Pd]>[C:27]([O:26][C:24]([NH:23][C@H:22]([C:21]([N:17]1[CH2:18][CH2:19][CH2:20][C@H:16]1[C:15]([N:11]1[CH2:12][CH2:13][CH2:14][C@H:10]1[C:9]([OH:34])=[O:8])=[O:33])=[O:32])[CH3:31])=[O:25])([CH3:28])([CH3:29])[CH3:30]N-t-butyloxycarbonyl-L-alanyl-L-prolyl-L-proline benzylester (5.0 g, 10.6 m mole) was dissolved in methanol (100 ml) and hydrogen gas was passed through the solution in the presence of the palladium carbon as a catalyst for 3 hours. The catalyst was removed by filtration and the solvent was distilled off under reduced pressure. Thus obtained residue was dissolved in water and the solution was freeze-dried to give N-t-butyloxycarbonyl-L-alanyl-L-prolyl-L-proline (4.04 g).
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