glutathione <=> L-cysteinylglycine + 5-oxo-L-proline
glutathione <=> l-cysteinylglycine + 5-oxo-l-proline
glutathione <=> L-cysteinylglycine + 5-oxo-L-proline
glutathione <=> l-cysteinylglycine + 5-oxo-l-proline