ethyl 1-methyl-2-(methylthio)-6-oxo-1,6-dihydropyrimidine-5-carboxylate

3-methyl-2,4-dioxo-1,2,3,4-tetrahydro-pyrimidine-5-carboxylic acid ethyl ester

ethyl 3-methyl-4-oxo-2-sulfanylidene-1H-pyrimidine-5-carboxylate

2'-O,3,3'-O,5'-O-四甲基尿苷

5-diazo-6-methoxy-3-methyldihydrouracil