Reaction catalyzed by NADPH:quinone reductase (1.6.5.5)
+
NADPH
+
=
+
NADP+
5-hydroxy-2-methyl-1,4-naphthoquinone
+
NADPH
+
H+
=
5-hydroxy-2-methyl-1,4-naphthosemiquinone
+
NADP+