C(OC([NH:8][N:9]([C:19]([NH:21][C@H:22]([C:26]([NH:28][C@@H:29]([CH2:51][C:52]1[CH:57]=[CH:56][CH:55]=[CH:54][CH:53]=1)[CH2:30][C@H:31]([OH:50])[C@@H:32]([NH:40][C:41]([O:43][CH2:44][C:45]1[S:49][CH:48]=[N:47][CH:46]=1)=[O:42])[CH2:33][C:34]1[CH:39]=[CH:38][CH:37]=[CH:36][CH:35]=1)=[O:27])[CH:23]([CH3:25])[CH3:24])=[O:20])[CH2:10][C:11]1[N:12]=[C:13]([CH:16]([CH3:18])[CH3:17])[S:14][CH:15]=1)=O)(C)(C)C.[ClH:58].C(OCC)C>O1CCOCC1.CO>[ClH:58].[NH2:8][N:9]([C:19]([NH:21][C@H:22]([C:26]([NH:28][C@@H:29]([CH2:51][C:52]1[CH:57]=[CH:56][CH:55]=[CH:54][CH:53]=1)[CH2:30][C@H:31]([OH:50])[C@@H:32]([NH:40][C:41]([O:43][CH2:44][C:45]1[S:49][CH:48]=[N:47][CH:46]=1)=[O:42])[CH2:33][C:34]1[CH:35]=[CH:36][CH:37]=[CH:38][CH:39]=1)=[O:27])[CH:23]([CH3:24])[CH3:25])=[O:20])[CH2:10][C:11]1[N:12]=[C:13]([CH:16]([CH3:17])[CH3:18])[S:14][CH:15]=1To 60 mg (0.073 mmol) of (2S,3S,5S)-5-(N-(N-((N-(tert-butyloxycarbonyl-amino)-N-((2-isopropyl-4-thiazolyl)methyl)amino)carbonyl)valinyl)amino)-2-(N-((5-thiazolyl)methoxycarbonyl)amino)-1,6-diphenyl-3-hydroxyhexane was added 5 ml of 4 M HCl in dioxane. The resulting solution was stirred at ambient temperature for 2 h. After concentration of the solution in vacuo, the residue was taken up in 0.5 ml of methanol, added to 20 ml of diethyl ether, and filtered to provide 40 mg (77%) of the desired compound (Rf 0.60, 10% methanol in chloroform). Mass spectrum: (M+H)+ =722.
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