preferred_name: 4-aminobutanoate + L-histidine => L-homocarnosine + H2O
preferred_name_lc: 4-aminobutanoate + l-histidine => l-homocarnosine + h2o
label: 4-aminobutanoate + L-histidine => L-homocarnosine + H2O
label_lc: 4-aminobutanoate + l-histidine => l-homocarnosine + h2o