Many viruses need their sulphydryl groups to be reduced in order to be allowed to enter cells. SARS-CoV-2, which belongs to Coronaviridae family and is responsible for coronavirus disease 2019 or COVID-19, has cysteine-rich proteins in its capsid as the main CoV protease (MPRO), which must be intact and active maintaining the viral activity. Considering that MPRO is an important molecular target for development...