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

7-amino-6-cyano-1,3-bis(methoxymethyl)pyrido(2,3-d)pyrimidine-2,4(1H,3H)-dione

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

7-hydroxy-1,3-bis(methoxymethyl)-2,4-dioxo-1,2,3,4-tetrahydropyrido[2,3-d]pyrimidine-6-carbonitrile

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