2-amino-4-oxo-3,4-dihydro-pteridine-7-carboxylic acid, 2-amino-1,4-dihydro-4-oxopteridine-7-carboxylic acid, 7-Carboxypterin, 7-pterine carboxylic acid, Pterin-7-carbonsaeure, 2-Amino-4-oxo-3,4-dihydro-pteridin-7-carbonsaeure, pterin-7-carboxylic acid