cyclohexyl-hydrazine-N,N'-dicarboxylic acid diamide

1-methyl-5-phenylimidazolidine-2,4-dione

2-氰基乙基脲

7-methyl-3,4-dihydro-1H-pyrimido[4,5-d]pyrimidin-2-one

5-甲基乙内酰脲