pteridine-containing compound metabolic process dihydrobiopterin metabolic process 7,8-dihydrobiopterin metabolic process 6,7-dihydrobiopterin metabolic process dihydropterin metabolic process dihydrobiopterin reduction GO:0051066 dihydropterin metabolism The chemical reactions and pathways involving a dihydrobiopterin, a reduced pteridine derivative related to folic acid; it acts as an electron carrier in tyrosine biosynthesis and its quinoid form is produced by oxidation of tetrahydrobiopterin in several biological hydroxylation reactions. biological_process