4-amino-5-hydroxymethyl-2-methylpyrimidine + NH4(+) => 4-amino-5-aminomethyl-2-methylpyrimidine + H2O
4-amino-5-hydroxymethyl-2-methylpyrimidine + nh4(+) => 4-amino-5-aminomethyl-2-methylpyrimidine + h2o