thiamine + H2O = 5-(2-hydroxyethyl)-4-methylthiazole + 4-amino-5-hydroxymethyl-2-methylpyrimidine + H(+)
thiamine + h2o = 5-(2-hydroxyethyl)-4-methylthiazole + 4-amino-5-hydroxymethyl-2-methylpyrimidine + h(+)