preferred_name: 2-oxobutanoate + L-cysteine + NH4(+) => L,L-cystathionine + H2O
preferred_name_lc: 2-oxobutanoate + l-cysteine + nh4(+) => l,l-cystathionine + h2o
label: 2-oxobutanoate + L-cysteine + NH4(+) => L,L-cystathionine + H2O
label_lc: 2-oxobutanoate + l-cysteine + nh4(+) => l,l-cystathionine + h2o