N-叔丁基氨基甲酸乙酯

5-甲基脲嘧啶

N,N'-bis-(4-methyl-2,5-dioxo-imidazolidin-4-yl)-urea

2,2-diureidopropanoic acid

5,6-二羟基-5-甲基-1,3-二嗪农-2,4-二酮