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