Reaction catalyzed by sepiapterin reductase (L-erythro-7,8-dihydrobiopterin forming) (1.1.1.153)
+
NADP+
=
+
NADPH
+
L-erythro-7,8-dihydrobiopterin
+
NADP+
=
sepiapterin
+
NADPH
+
H+
