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