[C:1]1([S:7][C:8]2[CH:9]=[C:10]([CH:14]3OCC[O:15]3)[CH:11]=[CH:12][CH:13]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.C(=O)(O)[O-].[Na+]>C(O)C.O.O1CCCC1.S(=O)(=O)(O)O>[C:1]1([S:7][C:8]2[CH:9]=[C:10]([CH:11]=[CH:12][CH:13]=2)[CH:14]=[O:15])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=12-(3-Phenylsulfanyl-phenyl)-[1,3]dioxolane described in Preparation Example 91 (396 mg, 1.53 mmol) was dissolved in a mixture solution of ethanol (5 mL), water (5 mL), tetrahydrofuran (5 mL) and sulfuric acid (1 mL), and the solution was stirred for 2.5 hours under reflux. The reaction solution was cooled to 0° C., an aqueous solution of saturated sodium bicarbonate was added thereto, the solution was extracted with ethyl acetate, the organic layer was washed with brine and dried over anhydrous magnesium sulfate. The solvent was evaporated in vacuo, the residue was purified by silica gel column chromatography (hexane:ethyl acetate=20:1), and the title compound (323 mg, 1.51 mmol, 98%) was obtained as a colorless oil.
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