1-[N-(1,3-dipivaloyloxyprop-2-yl)acetylaminomethyl]-5-methyl-1H,3H-pyrimidin-4-on-2-thione

ethyl 3-(N-methylcyanamino)-2-butenoate

4-氨基-2-巯基嘧啶

3,3-二乙氧基丙酸乙酯

thiourea