preferred_name: hydrogencarbonate + 2 NH4(+) => urea + 2 H2O + H(+)
preferred_name_lc: hydrogencarbonate + 2 nh4(+) => urea + 2 h2o + h(+)
label: hydrogencarbonate + 2 NH4(+) => urea + 2 H2O + H(+)
label_lc: hydrogencarbonate + 2 nh4(+) => urea + 2 h2o + h(+)