3.5.1.54 allophanate + H2O the reverse reaction is catalyzed by urea carboxylase 2 CO2 + 2 NH3 - ir 432652 3.5.1.54 allophanate + H2O - 2 CO2 + 2 NH3 - ? 432652 3.5.1.54 allophanate + H2O - 2 CO2 + 2 NH3 - ir 432652 3.5.1.54 allophanate + H2O the enzyme exhibits high specificity for allophanate 2 CO2 + 2 NH3 - ? 432652 3.5.1.54 urea-1-carboxylate + H2O - 2 CO2 + 2 NH3 - ? 449011 3.5.1.54 urea-1-carboxylate + H2O - 2 CO2 + 2 NH3 - r 449011 3.5.1.54 biuret + H2O - ? - ? 384340 3.5.1.54 malonamic acid + H2O - ? - ? 385115 3.5.1.54 malonamide + H2O - ? - ? 385117 3.5.1.54 additional information allophanate also shows nonenzymatic decomposition, half-life at pH 8.0 is 50 h ? - ? 89