4-amino-2-methylsulfanyl-8H-pyrido[2,3-d]pyrimidin-7-one

2-甲硫基嘧啶-4,5,6-三胺

2-羟基-4,6-二氨基嘧啶

diethyl 2-[[(6-acetamido-2-methylsulfanylpyrimidin-4-yl)amino]methylidene]propanedioate

ethyl 4-acetamido-2-methylsulfanyl-5-oxo-8H-pyrido[2,3-d]pyrimidine-6-carboxylate