From:  Molecular docking analysis of peptide-based antiviral agents against SARS-CoV-2 main protease: an approach towards drug repurposing

The antiviral peptides blocking sites of certain viral replication cycle. The inhibition sites are 1: viral association; 2: viral penetration; 3: endosomal escape; 4: viral uncoating; 5: viral genome replication; 6: release of mature virions