6-氯-1,3-二甲基脲嘧啶

丙酮

1,3-二甲基-5-氰基尿嘧啶

1,3,7-trimethyl-2,4-dioxo-1,2,3,4-tetrahydro-pyrido[2,3-d]pyrimidine-5-carboxylic acid