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