Aligos Therapeutics Inc. and Katholieke Universiteit Leuven have jointly patented 3C-like proteinase (3CLpro; Mpro; nsp5) (SARS-CoV-2; COVID-19 virus) inhibitors for the treatment of SARS-CoV-2 infection (COVID-19), middle East respiratory syndrome coronavirus (MERS-CoV) infection, norovirus and rhinovirus infections.