[CH3:1][C:2]1([CH3:52])[CH2:13][C:12]2[CH:11]=[C:10]3[N:5]([CH2:6][CH2:7][N:8]([C:15]4[C:20]([CH2:21][OH:22])=[C:19]([C:23]5[CH:24]=[C:25]([NH:31][C:32]6[N:37]=[CH:36][C:35]([N:38]7[CH2:43][CH2:42][N:41](C(OC(C)(C)C)=O)[CH2:40][C@@H:39]7[CH3:51])=[CH:34][CH:33]=6)[C:26]([O:29]C)=[N:27][CH:28]=5)[CH:18]=[CH:17][N:16]=4)[C:9]3=[O:14])[C:4]=2[CH2:3]1>O1CCOCC1.Cl>[OH:22][CH2:21][C:20]1[C:15]([N:8]2[CH2:7][CH2:6][N:5]3[C:10](=[CH:11][C:12]4[CH2:13][C:2]([CH3:52])([CH3:1])[CH2:3][C:4]=43)[C:9]2=[O:14])=[N:16][CH:17]=[CH:18][C:19]=1[C:23]1[CH:24]=[C:25]([NH:31][C:32]2[CH:33]=[CH:34][C:35]([N:38]3[CH2:43][CH2:42][NH:41][CH2:40][C@@H:39]3[CH3:51])=[CH:36][N:37]=2)[C:26](=[O:29])[NH:27][CH:28]=1A solution of 271b (286.6 mg, 0.40 mmol) in dioxane/HCl (30 mL) was stirred at 50° C. for 2 h. It was evaporated under reduced pressure to afford 271c (450 mg, crude) as a black solid. MS-ESI: [M+H]+ 595.3
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