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