diethyl 2-[[4-[(2,4-diaminopyrido[2,3-d]pyrimidin-6-yl)methylamino]benzoyl]amino]pentanedioate

6-(acetoxymethyl)-1,3-bis(methoxymethyl)pyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione

6-(acetoxymethyl)pyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione

((N-nitrosoacetamido)methyl)-1,3-bis(methoxymethyl)pyrido(2,3-d)pyrimidine-2,4(1H,3H)-dione

6-(hydroxymethyl)pyrido(2,3-d)pyrimidine-2,4(1H,3H)-dione