title: [Pyrimidine derivatives. VI. Studies on the syntheses of orotic acid, uracil and pyrimido(5,4-d)pyrimidine derivatives].
mesh_terms: D013058:Mass Spectrometry; D009963:Orotic Acid / Q000138:chemical synthesis*; D011743:Pyrimidines / Q000138:chemical synthesis*; D013055:Spectrophotometry, Infrared; D014498:Uracil / Q000138:chemical synthesis*
chemical_list: D011743:Pyrimidines; D014498:Uracil; D009963:Orotic Acid