To a solution composed of 108 mg (90.2 weight %, 0.3 mmol) of the (5S)-6-benzoyloxy-3,5-dihydroxyhexanoic tert-butyl ester produced in Example 15, 62.4 mg (0.6 mmol) of 2,2-dimethoxypropane, and 5 mL of acetone were added 5.7 mg (0.03 mmol) of p-toluenesulfonic acid.1H2O and 15.2 mg (0.15 mmol) of triethylamine, and the mixture was stirred at 40° C. for 16 hours. This reaction mixture was analyzed by high-performance liquid chromatography (column: Develosil ODS-HG-3 4.6×250 mm, product of Nomura Chemical, eluent: water/acetonitrile=50/50, flow rate: 1.0 mL/min, detector: UV 220 nm, column temperature: 40° C.). The compositional yield values were as follows.
