preferred_name: 2-oxobutanoate + hydrogen sulfide + NH4(+) + H(+) => L-homocysteine + H2O
preferred_name_lc: 2-oxobutanoate + hydrogen sulfide + nh4(+) + h(+) => l-homocysteine + h2o
label: 2-oxobutanoate + hydrogen sulfide + NH4(+) + H(+) => L-homocysteine + H2O
label_lc: 2-oxobutanoate + hydrogen sulfide + nh4(+) + h(+) => l-homocysteine + h2o