label: 6-pyruvoyl-5,6,7,8-tetrahydropterin + 2 NADPH + 2 H(+) => (6R)-5,6,7,8-tetrahydrobiopterin + 2 NADP(+)
label_lc: 6-pyruvoyl-5,6,7,8-tetrahydropterin + 2 nadph + 2 h(+) => (6r)-5,6,7,8-tetrahydrobiopterin + 2 nadp(+)