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