Reaction catalyzed by 5-amino-6-(5-phosphoribosylamino)uracil reductase (1.1.1.193)
+
NADP+
=
+
NADPH
+
5-amino-6-(5-phospho-D-ribitylamino)uracil
+
NADP+
=
5-amino-6-(5-phospho-D-ribosylamino)uracil
+
NADPH
+
H+
