[CH2:1]([N:8]1[C:12](=[O:13])[CH2:11][CH2:10][C@@H:9]1[C:14]([NH:16][CH:17]([CH2:23][C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1)[CH:18]([OH:22])[C:19](O)=[O:20])=[O:15])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH:30]([O:33][NH2:34])([CH3:32])[CH3:31]>>[CH2:1]([N:8]1[C:12](=[O:13])[CH2:11][CH2:10][C@@H:9]1[C:14]([NH:16][CH:17]([CH:18]([OH:22])[C:19]([NH:34][O:33][CH:30]([CH3:32])[CH3:31])=[O:20])[CH2:23][C:24]1[CH:25]=[CH:26][CH:27]=[CH:28][CH:29]=1)=[O:15])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1The reaction can be carried out in analogy to reaction step 1.3 by reacting 3-((R)-1-benzyl-5-oxopyrrolidine-2-carboxamido)-2-hydroxy-4-phenylbutanoic acid with O-isopropylhydroxylamine.
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