7-methylspiro<4.5>dec-7-ene-1,4-dione

3,7-二氢-7-(甲氧基甲基)-3-甲基-2-(甲硫基)-4H-吡咯并[2,3-d]嘧啶-4-酮

4-氯-7-(甲氧基甲基)-7H-吡咯并[2,3-d]嘧啶-2-胺

5-fluoro-1-(methoxymethyl)pyrimidine-2,4-dione

1,3-bis(methoxymethyl)-5-fluorouracil