C([O:5][C:6](=[O:25])[CH2:7][C:8]1[C:9]([CH2:23][CH3:24])=[N:10][N:11]([CH2:15][C:16]2[CH:21]=[CH:20][C:19]([NH2:22])=[CH:18][CH:17]=2)[C:12]=1[CH2:13][CH3:14])(C)(C)C.[C:26](=[O:29])([O-:28])N>>[CH2:15]([O:28][C:26]([NH:22][C:19]1[CH:18]=[CH:17][C:16]([CH2:15][N:11]2[C:12]([CH2:13][CH3:14])=[C:8]([CH2:7][C:6]([OH:5])=[O:25])[C:9]([CH2:23][CH3:24])=[N:10]2)=[CH:21][CH:20]=1)=[O:29])[C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1Example 3.3 was prepared according to the method described for method 3.1, employing intermediate 2.1.2 instead of intermediate 1.1.3 in the carbamate formation step. The subsequent cleavage of the tert-butyl ester was performed under acidic conditions as described for example 2.1.
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