A solution of 6-(2,3-Dihydroxy-propoxy)-2-pyrrolo[1,2-c]pyrimidin-3-yl-chromen-4-one O-tert-butyl oxime (example 86A) (100 mg, 0.236 mmol) in toluene (8 ml) was treated at 0° C. with trifluoro acetic acid (2 ml) and heated at 60° C. for 5.5 hours. The solution was concentrated under vacuum, the residue dissolved in ethyl acetate and washed successively with a saturated solution of sodium hydrogenocarbonate, brine, dried over sodium sulfate and concentrated. The residue was purified by silica gel flash chromatography (gradient cyclohexane/ethyl acetate: 0-100% then ethyl acetate/methanol:90/10) to yield the title compound (38 mg, 44%) as a brown-yellow solid.
