5-amino-6-(5-phospho-D-ribitylamino)uracil + NADP(+) => 5-amino-6-(5-phospho-D-ribosylamino)uracil + NADPH + H(+)
5-amino-6-(5-phospho-d-ribitylamino)uracil + nadp(+) => 5-amino-6-(5-phospho-d-ribosylamino)uracil + nadph + h(+)