[CH2:1]([N:9]([CH3:25])[C:10]([C@@H:12]1[CH2:16][C@@H:15]([OH:17])[CH2:14][N:13]1C(OC(C)(C)C)=O)=[O:11])[CH2:2][CH2:3][CH2:4][CH2:5][CH:6]=[CH:7][CH3:8].C(N(C)C([C@@H]1C[C@@H](O)CN1)=O)CCCC=C>>[CH2:1]([N:9]([CH3:25])[C:10]([C@@H:12]1[CH2:16][C@@H:15]([OH:17])[CH2:14][NH:13]1)=[O:11])[CH2:2][CH2:3][CH2:4][CH2:5][CH:6]=[CH:7][CH3:8]Compound 71b was synthesized from compound 70b as yellow oil in 51% yield, following the procedure as described for compound 49.
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