Reaction catalyzed by 6,7-dihydropteridine reductase (1.5.1.34)
+
NADPH
+
=
+
NADP+
6,7-dimethyl-7,8-dihydropterin
+
NADPH
+
H+
=
6,7-dimethyl-5,6,7,8-tetrahydropterin
+
NADP+
