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Coronaviruses (CoVs) are positive single-stranded RNA viruses that cause severe respiratory syndromes in humans, including severe acute respiratory syndrome (SARS) and Middle East respiratory syndrome (MERS). Coronavirus disease 2019 (COVID-19) caused by a novel severe acute respiratory syndrome CoV (SARS-CoV-2) at the end of 2019 became a global pandemic. The 3C-like cysteine protease (3CLpro) processes viral polyproteins to yield mature non-structural proteins, thus playing an important role in the CoV life cycle, and therefore is consi