preferred_name: L-alanine + L-methionine => L-methionyl-L-alanine + H2O
preferred_name_lc: l-alanine + l-methionine => l-methionyl-l-alanine + h2o
label: L-alanine + L-methionine => L-methionyl-L-alanine + H2O
label_lc: l-alanine + l-methionine => l-methionyl-l-alanine + h2o