[CH2:1]([O:5][C:6]([CH2:8][S:9][C:10]1[S:11][C:12]2[C:17]([N:18]=1)=[CH:16][CH:15]=[CH:14][N:13]=2)=[O:7])[CH2:2][CH2:3][CH3:4].ClC1C=CC=C(C(OO)=[O:27])C=1.C(OCC)(=O)C>C(Cl)Cl>[CH2:1]([O:5][C:6]([CH2:8][S:9]([C:10]1[S:11][C:12]2[C:17]([N:18]=1)=[CH:16][CH:15]=[CH:14][N:13]=2)=[O:27])=[O:7])[CH2:2][CH2:3][CH3:4]Dissolved in 50 ml of methylene chloride was 18.5 g of the compound obtained in Example 1, and the solution was cooled down to -10° C. 16.2 g of m-chloroperbenzoic acid (with a 70% purity) was added to the solution, which was in turn stirred at that temperature for 40 minutes. Ethyl acetate (600 ml) was added to the solution, which was then washed once with an aqueous solution of sodium thiosulfate, three times with sodium hydrogencarbonate and once with water, dried over magnesium sulfate, and distilled to remove the solvent. The residue was purified by silica gel column chromatography, and eluting with n-hexane-ethyl acetate (5:3 to 3:1) to obtain the title compound (13.4 g).
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