The aqueous layer was extracted with EtOAc (3 x 5 mL). The combined organic extracts were washed with brine (5 mL), dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure by rotary evaporation to give a crude colorless solid. Purification by flash column chromatography on silica gel (80% Et2O/hexanes) afforded 9-6 (17.1 mg, 76%) as a colorless foam.