2,3-dioxopropanoic acid

diethyl 2-(5-oxooxolan-2-ylidene)propanedioate

4-羟基-2,5-二氧代-4-咪唑烷羧酸

1-(4-hydroxy-3-methyl-2,5-dioxo-imidazolidine-4-carbonyl)-3-methyl-urea

双氧水