label: 5-amino-6-(5-phospho-D-ribosylamino)uracil + NH4(+) => 2,5-diamino-6-hydroxy-4-(5-phosphoribosylamino)-pyrimidine + H2O + H(+)
label_lc: 5-amino-6-(5-phospho-d-ribosylamino)uracil + nh4(+) => 2,5-diamino-6-hydroxy-4-(5-phosphoribosylamino)-pyrimidine + h2o + h(+)