Abz-FRLKGGAPIKGV-EDDNP TFA is a fluorogenic substrate used to measure the enzymatic activities of protease forms, such as papain-like protease 2 (PLP2) from severe acute respiratory syndrome coronavirus ( SARS-CoV ). Abz-FRLKGGAPIKGV-EDDNP TFA has the potential for study 2019-nCoV (COVID-19) infection.