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A solution of ethyl 2-[3-(4-bromo-2-fluorobenzyl)-7-chloro-1,2,3,4-tetrahydro-2,4-dioxoquinazolin-1-yl]-acetate (69 g) and 1N aqueous sodium hydroxide (191 ml) in ethanol (350 ml) was stirred at 60° C. for 3 hours. After cooling to 0° C., the precipitates were collected by filtration, washed with water, and dried over phosphorus pentoxide. Recrystallization from water (360 ml) gave sodium 2-[3-(4-bromo-2-fluorobenzyl)-7-chloro-1,2,3,4-tetrahydro-2,4-dioxoquinazolin-1-yl]acetate (39.2 g).

1. filtrationthe precipitates were collected by filtration
2. washwashed with water
3. dry with materialdried over phosphorus pentoxide
4. customRecrystallization from water (360 ml)