urea-1,3-dicarboxylate + NH4(+) => 1-carboxybiuret + H2O
urea-1,3-dicarboxylate + nh4(+) => 1-carboxybiuret + h2o
urea-1,3-dicarboxylate + NH4(+) => 1-carboxybiuret + H2O
urea-1,3-dicarboxylate + nh4(+) => 1-carboxybiuret + h2o