C(O[C:4]([C:6]1[N:7]=[CH:8][O:9][C:10]=1[C:11]1[CH:16]=[CH:15][CH:14]=[C:13]([C:17]2[CH2:18][C:19](=[O:33])[NH:20][C:21]3[CH:27]=[C:26]([N:28]4[CH:32]=[CH:31][CH:30]=[CH:29]4)[CH:25]=[CH:24][C:22]=3[N:23]=2)[CH:12]=1)=[O:5])C>NCCO>[OH:5][CH2:4][CH2:6][NH:7][C:4]([C:6]1[N:7]=[CH:8][O:9][C:10]=1[C:11]1[CH:16]=[CH:15][CH:14]=[C:13]([C:17]2[CH2:18][C:19](=[O:33])[NH:20][C:21]3[CH:27]=[C:26]([N:28]4[CH:32]=[CH:31][CH:30]=[CH:29]4)[CH:25]=[CH:24][C:22]=3[N:23]=2)[CH:12]=1)=[O:5]A solution of 5-[3-(4-oxo-7-pyrrol-1-yl-4,5-dihydro-3H-benzo[b][1,4]diazepin-2-yl)-phenyl]-oxazole-4-carboxylic acid ethyl ester (Example 23) (35mg) in 2-amino-ethanol (1 mL) was stirred at 50° C. for 4 h. The mixture was partitioned between H2O and EtOAc. The organic layer was dried and evaporated in vacuum, and the residue was triturated with EtOAc to give the title compound (20 mg) as light-yellow solid.
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