[CH3:1][O:2][C:3]1[C:27]([O:28][CH3:29])=[CH:26][C:6]2[S:7][C:8](/[CH:19]=[CH:20]/[C:21]([O:23][CH2:24][CH3:25])=[O:22])=[C:9]([O:10][C:11]3[CH:16]=[CH:15][C:14]([O:17][CH3:18])=[CH:13][CH:12]=3)[C:5]=2[CH:4]=1.[H][H]>CO.[Pd]>[CH3:1][O:2][C:3]1[C:27]([O:28][CH3:29])=[CH:26][C:6]2[S:7][C:8]([CH2:19][CH2:20][C:21]([O:23][CH2:24][CH3:25])=[O:22])=[C:9]([O:10][C:11]3[CH:16]=[CH:15][C:14]([O:17][CH3:18])=[CH:13][CH:12]=3)[C:5]=2[CH:4]=1A solution containing 0.8 mmol of the product obtained in Example 9 in 20 ml of methanol, and 0.2 g of 10% Pd/C is maintained at 40° C. for 24 hours under a stream of hydrogen. Filtration and concentration under reduced pressure and chromatography over silica gel (cyclohexane/ethyl acetate: 80/20) enable the expected product to be isolated.
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