[CH3:1][S:2](Cl)(=[O:4])=[O:3].Cl.Cl.[Cl:8][C:9]1[CH:10]=[C:11]([CH:31]=[CH:32][C:33]=1[Cl:34])[CH2:12][N:13]1[CH2:18][CH2:17][O:16][C@@H:15]([CH2:19][NH:20][C:21]([NH:23][CH2:24][CH:25]2[CH2:30][CH2:29][NH:28][CH2:27][CH2:26]2)=[O:22])[CH2:14]1.C(N(CC)C(C)C)(C)C>ClCCl>[Cl:8][C:9]1[CH:10]=[C:11]([CH:31]=[CH:32][C:33]=1[Cl:34])[CH2:12][N:13]1[CH2:18][CH2:17][O:16][C@@H:15]([CH2:19][NH:20][C:21]([NH:23][CH2:24][CH:25]2[CH2:30][CH2:29][N:28]([S:2]([CH3:1])(=[O:4])=[O:3])[CH2:27][CH2:26]2)=[O:22])[CH2:14]1Methane sulphonyl choride (0.013 ml) was added to a solution of Intermediate 18 (0.054 g) and N,N-diisopropylethylamine (0.063 ml) in dichloromethane (2 ml). The solution was stirred for 16 h at 23° C. The solvent was removed in vacuo and the residue purified by solid phase extraction (Isolute SCX sulphonic acid column) eluting with methanol followed by 10% 0.880 ammonia solution in methanol, to give the title compound as a clear gum (0.035 g).
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