1,3,6-trimethyl-7-(methylthio)pyrimido[5,4-g]pteridine-2,4,5-(1H,3H,6H)-trione 10-oxide

6-methyl-5-(methylthio)furazano[3,4-d]pyrimidin-7(6H)-one

1,3-dimethyl-2,4-dioxopteridine-6-carboxylic acid

7-氨基-1,3-二甲基-2,4(1H,3H)-蝶啶二酮

7-amino-1,3-dimethyl-5,6-dihydropteridine-2,4-dione