an S-substituted L-cysteinylglycine + H2O = an S-substituted L-cysteine + glycine
an s-substituted l-cysteinylglycine + h2o = an s-substituted l-cysteine + glycine
"cysteinylglycine-S-conjugate dipeptidase"
"cysteinylglycine-s-conjugate dipeptidase"