title: Purine studies. IX. Nucleophilic addition of barbituric acids to purines.
mesh_terms: D001463:Barbiturates; D055598:Chemical Phenomena; D002621:Chemistry; D009682:Magnetic Resonance Spectroscopy; D011687:Purines; D013056:Spectrophotometry, Ultraviolet
chemical_list: D001463:Barbiturates; D011687:Purines