C(OC[O:5][CH:6]1[CH2:24][CH:23]2[N:8]([C:9](=[O:45])[N:10](CC3C=CC(OC)=CC=3)[CH2:11][CH2:12][CH2:13][CH2:14][CH2:15][CH:16]=[CH:17][CH:18]3[C:20]([C:26]([NH:28][S:29]([C:32]4([CH3:35])[CH2:34][CH2:33]4)(=[O:31])=[O:30])=[O:27])([NH:21][C:22]2=[O:25])[CH2:19]3)[CH2:7]1)C.ClCCl.FC(F)(F)C(O)=O.O>C(OCC)(=O)C.CO>[OH:5][CH:6]1[CH2:24][CH:23]2[N:8]([C:9](=[O:45])[NH:10][CH2:11][CH2:12][CH2:13][CH2:14][CH2:15][CH:16]=[CH:17][CH:18]3[C:20]([C:26]([NH:28][S:29]([C:32]4([CH3:35])[CH2:34][CH2:33]4)(=[O:31])=[O:30])=[O:27])([NH:21][C:22]2=[O:25])[CH2:19]3)[CH2:7]1The acetal compound 22a (0.301 g, 0.465 mmol) was deprotected using 2:1:0.1 dichloromethane/trifluoroacetic acid/H2O (6.2 ml) at rt for 4 h, then conc onto silica and flash chromatography using 9:1 ethyl acetate/methanol gave the product as a colorless foam (0.065 g, 30%). LR-MS: Calcd for C21H33N4O6S: 469. Found: 469 [M+H].
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