C([S:4][CH2:5][CH:6]([CH2:17][C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1)[C:7]([N:9]1[CH2:16][CH2:15][CH2:14][C@H:10]1[C:11]([OH:13])=[O:12])=[O:8])(=O)C.N>>[SH:4][CH2:5][CH:6]([CH2:17][C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1)[C:7]([N:9]1[CH2:16][CH2:15][CH2:14][C@H:10]1[C:11]([OH:13])=[O:12])=[O:8]1-(3-Acetylthio-2-benzylpropanoyl)-L-proline is treated with methanolic ammonia according to the procedure of Example 34 to obtain 1-(3-mercapto-2-benzylpropanoyl)-L-proline.
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