[NH:1]=[C:2]([C:13]1[CH:18]=[CH:17][CH:16]=[C:15]([NH:19][C:20]([NH:22][C:23]2[CH:28]=[CH:27][C:26]([S:29](=[O:43])(=[O:42])[NH:30][CH2:31][C:32]3[CH:37]=[CH:36][C:35]([S:38](=[O:41])(=[O:40])[NH2:39])=[CH:34][CH:33]=3)=[CH:25][CH:24]=2)=[O:21])[CH:14]=1)[N:3]1[CH2:8][CH2:7][N:6]([C:9]([O:11][CH3:12])=[O:10])[CH2:5][CH2:4]1.CCN(C(C)C)C(C)C.[C:53](Cl)(=[O:55])[CH3:54].O>C(Cl)Cl.CN(C=O)C>[C:53]([N:1]=[C:2]([C:13]1[CH:18]=[CH:17][CH:16]=[C:15]([NH:19][C:20]([NH:22][C:23]2[CH:24]=[CH:25][C:26]([S:29](=[O:42])(=[O:43])[NH:30][CH2:31][C:32]3[CH:37]=[CH:36][C:35]([S:38](=[O:41])(=[O:40])[NH2:39])=[CH:34][CH:33]=3)=[CH:27][CH:28]=2)=[O:21])[CH:14]=1)[N:3]1[CH2:4][CH2:5][N:6]([C:9]([O:11][CH3:12])=[O:10])[CH2:7][CH2:8]1)(=[O:55])[CH3:54]100 mg of compound 60 were dissolved in 2 ml of DCM/DMF 1:1 solution, containing 2 eq of DIEA. Under stirring and at 0° C., 6 eq of acetylchloride were added portionwise during 30 minutes. The solution was stirred overnight at rt, then water was added and a precipitate formed. The precipitate was separated and the title compound was obtained after preparative HPLC purification.
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