Reaction catalyzed by 6,7-dihydropteridine reductase (1.5.1.34)
+
NAD+
=
+
NADH
+
6,7-dimethyl-5,6,7,8-tetrahydropterin
+
NAD+
=
quinonoid 6,7-dimethyl dihydropteridine
+
NADH
+
H+
