label: 2-methyl-3-sulfanylbutan-1-ol + pyruvate + NH4(+) => S-(4-hydroxy-3-methylbutan-2-yl)-L-cysteine + H2O
label_lc: 2-methyl-3-sulfanylbutan-1-ol + pyruvate + nh4(+) => s-(4-hydroxy-3-methylbutan-2-yl)-l-cysteine + h2o