title: Preparation of folic acid specifically labeled with carbon-13 in the benzoyl carbonyl.
mesh_terms: D002247:Carbon Isotopes; D005492:Folic Acid / Q000138:chemical synthesis*; D007202:Indicators and Reagents; D007553:Isotope Labeling / Q000379:methods; D013329:Structure-Activity Relationship
chemical_list: D002247:Carbon Isotopes; D007202:Indicators and Reagents; D005492:Folic Acid