甲基亚硝基脲

氨气

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

1-methyl-5-hydroxyhydantoin-5-(n-methylcarboxamide)

1,7-二甲基-2,6,8-三羟基嘌呤