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 yellow oil. Purification by flash column chromatography on silica gel (10% EtOAc/hexanes to 45% EtOAc/hexanes) afforded 12-12 (6.6 mg, 79%) as a colorless solid.