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