H1N1(3) antiviral activity(3) mechanism(2) Compound(2) offer(2) demonstrated(2) protease(2) Anti-influenza virus(2) Ginkgolic acids(2) medication(2) kinetic(2) Inhibition assays(2) tested(2) 3CL pro(2) Bioflavones(2) Viral(2) broad spectrum(2) activities(2) inhibitory(2) inhibit SARS-CoV-2(2) SARS-CoV-2(2) inhibition(2) Inhibitory mechanism(2) inhibitor(2) Ginkgo biloba(2) proteinase(2) less(2) docking(2) Ginkgo biloba leaves(2) viral replication(2)