The emergence of a new human betacoronavirus strain called Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) as the causative agent of CoronaVirus Disease 19 (COVID-19) has caused a pandemic. According to previous experiments, it is known that the 3C-like protease of SARS-CoV-2 plays an important role in the pathogenicity of the virus. Flavonoids are a group of natural substances bel…