Hydantoin was synthesized from glycine and sodium cyanate, which was condensed with benzaldehyde to give monohydrated sodium phenylpyruvate in 67.0% of overall yield after alkaline hydrolysis.

• 由甘氨酸和氰酸钠反应合成海因；然后与苯甲醛缩合；经碱水解得到一水合苯丙酮酸钠；总收率为67.；0%25。