Aligos Therapeutics Inc. and Katholieke Universiteit Leuven (KU Leuven ) have jointly developed new 3C-like proteinase (3CLpro; Mpro; nsp5) (SARS-CoV-2; COVID-19 virus) inhibitors reported to be useful for the treatment of SARS-CoV-2 infection (COVID-19), rhinovirus and norovirus infections.