The alkylation of diethyl N-(4-aminobenzoyl)glutamate (I) with propargyl bromide (II) in hot ethanol gives diethyl N-[4-(propargylamino)benzoyl]glutamate (III), which is condensed with 2-amino-6-bromomethyl-4-hydroxyquinazoline (IV) by means of triethylamine in hot 2-ethoxyethanol (or CaCO3 in dimethylacetamide) yielding diethyl N-[4-[N-[(2-amino-4-hydroxy-6-quinazolinyl)methyl]prop-2-ynylamino]benzoyl]-L-glutamate (V). Finally, this compound is saponified with NaOH in ethanol-water.