[C:1]([O:5][C:6]([C:8]1[S:9][C:10]([CH:13]=[CH:14][C:15]([O:17][CH2:18][CH3:19])=[O:16])=[CH:11][CH:12]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[H][H]>C(O)C.[Pd]>[C:1]([O:5][C:6]([C:8]1[S:9][C:10]([CH2:13][CH2:14][C:15]([O:17][CH2:18][CH3:19])=[O:16])=[CH:11][CH:12]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2]0.846 g (3 mmol) of the product obtained in step d) were dissolved in 100 ml of dry ethanol. 150 mg of 10% palladium on charcoal were added, and the suspension was hydrogenated at 50° C. and 4 bar hydrogen pressure. After filtration the solvent was removed in vacuo. 0.6 g of a colourless oil were obtained.
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