preferred_name: L-arginyl-L-phenylalanine + Met-enkephalin => Met-enkephalin-Arg-Phe + H2O
preferred_name_lc: l-arginyl-l-phenylalanine + met-enkephalin => met-enkephalin-arg-phe + h2o
label: L-arginyl-L-phenylalanine + Met-enkephalin => Met-enkephalin-Arg-Phe + H2O
label_lc: l-arginyl-l-phenylalanine + met-enkephalin => met-enkephalin-arg-phe + h2o