title: Specific enzyme inhibitors in vitamin biosynthesis. I. The synthesis of 8-substituted pyrido(2,3-d)pyrimidines.
mesh_terms: D003500:Cyclization; D005493:Folic Acid Antagonists; D008722:Methods; D011725:Pyridines / Q000138:chemical synthesis; D011743:Pyrimidines / Q000138:chemical synthesis*; D011804:Quinolines / Q000138:chemical synthesis; D012256:Riboflavin / Q000096:biosynthesis*; D014498:Uracil
chemical_list: D005493:Folic Acid Antagonists; D011725:Pyridines; D011743:Pyrimidines; D011804:Quinolines; D014498:Uracil; D012256:Riboflavin