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According to the procedure given for 210f, 209c (30.0 g, 81.0 mmol) was saponified with KOH (85%, 18.9 g, 286 mmol) in ethanol (143 mL) and water (48 mL) at reflux for 5 h. The solid product obtained after extraction and drying was purified by flash chromatography (silica; hexanes/ethyl acetate=90/10) to afford 210c (22.0 g, 86%) as a white solid. Mp 60-61.5° C. 1H NMR (CDCl3): δ 11.40 (br., 2H), 2.41 (t, 4H, J=7.3), 1.62-1.48 (m, 8H), 1.32-1.18 (m, 4H), 1.18 (s, 12H). 13C NMR (CDCl3=77.0 ppm): δ 211.11, 184.74, 42.49, 42.14, 40.42, 24.92, 24.62, 23.99. HRMS (LSIMS, gly): Calcd for C17H31O5 (MH+): 315.2171, found: 315.2183. HPLC: 94.5% pure. Anal. (C17H30O5) C, H.

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