C([O:4][CH:5]1[CH2:13][CH:8]2[O:9][C:10](=[O:12])[CH2:11][CH:7]2[CH:6]1[CH2:14][O:15]C(=O)C)(=O)C.C(=O)([O-])[O-].[K+].[K+].C(OCC)(=O)C.C(OCC)C>CO>[OH:4][CH:5]1[CH2:13][CH:8]2[O:9][C:10](=[O:12])[CH2:11][CH:7]2[CH:6]1[CH2:14][OH:15]To a solution of 50 (10.0 g, 39 mmol) in MeOH (100 mL) was added potassium carbonate (15 g). The suspension was stirred at room temperature for 3 hours. To the suspension was added ethyl acetate (60 mL). The resulting suspension was filtered through a pad of diatomaceous earth (Celite®). The filtrate was concentrated in vacuo to give crude product. The crude product was dissolved in MeOH (15 mL) and to it was added diethyl ether (100 mL). The resulting suspension was stirred for 2 hours at room temperature. The solid was filtered to give the title compound (3.62 g, 54%).
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