C(OC(=O)[NH:7][C:8]1([C:12]2[CH:17]=[CH:16][C:15]([C:18]3[C:23]([C:24]4[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=4)=[CH:22][N:21]4[C:30]([Br:33])=[CH:31][N:32]=[C:20]4[N:19]=3)=[CH:14][CH:13]=2)[CH2:11][CH2:10][CH2:9]1)(C)(C)C.Cl.CO>CO>[Br:33][C:30]1[N:21]2[CH:22]=[C:23]([C:24]3[CH:25]=[CH:26][CH:27]=[CH:28][CH:29]=3)[C:18]([C:15]3[CH:14]=[CH:13][C:12]([C:8]4([NH2:7])[CH2:9][CH2:10][CH2:11]4)=[CH:17][CH:16]=3)=[N:19][C:20]2=[N:32][CH:31]=1To a solution of 4-3 (52 mg, 0.1 mmol) in 1 mL of MeOH was added 4M HCl/MeOH (2 mL) and the mixture was stirred at room temperature for 3 h. The mixture was concentrated by evaporation and the residue was purified by prep.HPLC to give the product 4-4. MS (ESI) m/e (M+H+): 420.3
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