preferred_name: an S-substituted L-cysteinylglycine + H2O = an S-substituted L-cysteine + glycine
preferred_name_lc: an s-substituted l-cysteinylglycine + h2o = an s-substituted l-cysteine + glycine
label: an S-substituted L-cysteinylglycine + H2O = an S-substituted L-cysteine + glycine
label_lc: an s-substituted l-cysteinylglycine + h2o = an s-substituted l-cysteine + glycine