[CH:1]1([C:4](Cl)=[O:5])[CH2:3][CH2:2]1.Cl.Cl.[Cl:9][C:10]1[CH:11]=[C:12]([CH:32]=[CH:33][C:34]=1[Cl:35])[CH2:13][N:14]1[CH2:19][CH2:18][O:17][C@@H:16]([CH2:20][NH:21][C:22]([NH:24][CH2:25][CH:26]2[CH2:31][CH2:30][NH:29][CH2:28][CH2:27]2)=[O:23])[CH2:15]1.C(N(CC)C(C)C)(C)C>ClCCl>[CH:1]1([C:4]([N:29]2[CH2:30][CH2:31][CH:26]([CH2:25][NH:24][C:22]([NH:21][CH2:20][C@@H:16]3[O:17][CH2:18][CH2:19][N:14]([CH2:13][C:12]4[CH:32]=[CH:33][C:34]([Cl:35])=[C:10]([Cl:9])[CH:11]=4)[CH2:15]3)=[O:23])[CH2:27][CH2:28]2)=[O:5])[CH2:3][CH2:2]1Cyclopropanecarbonyl chloride (0.014 ml) was added to a solution of Intermediate 18 (0.54 g) and N,N-diisopropylethylamine (0.063 ml) in dichloromethane (2 ml). The solution was stirred for 3 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. The basic fraction was concentrated in vacuo and the residue was further purified using a silica gel solid phase extraction cartridge (1 g Varian Bond Elut) eluting with 0–1% methanol in ethyl acetate, to give the title compound as a clear gum (0.023 g).
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