Water → 3-[2-[4-(2-Methoxyphenyl)-1-piperazinyl]ethyl]-2,4(1H,3H)-quinazolinedione

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1-(2-Methoxyphenyl)-4-[2-(2-aminobenzoyl)aminoethyl]piperazine (3.54 g) and urea (1.2 g) were dissolved in dimethylformamide (20 ml) and the resulting solution was heated at an external temperature of 140° to 180° C. for 5 to 8 hours. After completion of the reaction, water (200 ml) was added to the reaction mixture and the resulting crystal was filtered off. Upon recrystallization from dioxane, 3-[2-[4-(2-methoxyphenyl)-1-piperazinyl]ethyl]2,4-(1H,3H)-quinazolinedione (3.5 g) was obtained as needles. Its physicochemical data was the same as that of the product obtained in (a).

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