title: Preparation of aminopterin and p-aminobenzoylglutamic acid specifically labeled with carbon-13 in the benzoyl carbonyl.
mesh_terms: D010129:4-Aminobenzoic Acid / Q000138:chemical synthesis*; D062365:Aminobenzoates / Q000138:chemical synthesis*; D000630:Aminopterin / Q000138:chemical synthesis*; D002247:Carbon Isotopes; D005971:Glutamates; D007202:Indicators and Reagents; D007553:Isotope Labeling / Q000379:methods; D062366:para-Aminobenzoates
chemical_list: D062365:Aminobenzoates; D002247:Carbon Isotopes; D005971:Glutamates; D007202:Indicators and Reagents; D062366:para-Aminobenzoates; C011398:4-aminobenzoylglutamic acid; D000630:Aminopterin; D010129:4-Aminobenzoic Acid