title: Carbon-13 nuclear magnetic resonance of 5-substituted uracils.
mesh_terms: D002247:Carbon Isotopes; D004563:Electrochemistry; D004735:Energy Transfer; D009682:Magnetic Resonance Spectroscopy; D013329:Structure-Activity Relationship; D013940:Thymidylate Synthase / Q000037:antagonists & inhibitors; D014498:Uracil
chemical_list: D002247:Carbon Isotopes; D014498:Uracil; D013940:Thymidylate Synthase