A solution of lithium hydroxide (21 mg, 0.88 mmol) in water (700 mL) was added to the product from Example 108 (100 mg, 0.18 mmol) in tetrahydrofuran (2 mL). The resulting mixture was stirred vigorously for 12 hours, then poured into 1M aqueous hydrochloric acid (20 mL) and extracted with ethyl acetate (2×40 mL). The combined organic layers were dried (NaSO4), and concentrated. The residue was purified using column chromatography on silica, eluting with 95/5/0.5 dichloromethane/methanol/acetic acid to give the title compound (79 mg).
