preferred_name: L-cysteine + L-alanine => L-alanyl-L-cysteine + H2O
preferred_name_lc: l-cysteine + l-alanine => l-alanyl-l-cysteine + h2o
label: L-cysteine + L-alanine => L-alanyl-L-cysteine + H2O
label_lc: l-cysteine + l-alanine => l-alanyl-l-cysteine + h2o