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A solution of 148 g. of 5-p-methoxybenzyl hydantoin and 188 g. of sodium hydroxide in one liter of water is heated at reflux for 25 hours. The solution is cooled and made acid to pH 1 with concentrated hydrochloric acid. The formed solid is separated by filtration, washed with water and dried to give the above named compound, mp. 255° C. dec.

1. temperatureat reflux for 25 hours
2. temperatureThe solution is cooled
3. customThe formed solid is separated by filtration
4. washwashed with water
5. customdried
6. customto give the