amide Amides 14 chemistry 7 human 6 Humans 5 Antiviral Agents 4 Pyrazines 4 Structure-Activity Relationship 4 antivirus agent 4 favipiravir 4 pyrazine derivative 4 structure activity relation 4 Antineoplastic Agents 3 Catalytic Domain 3 Protein Structure, Secondary 3 antineoplastic agent 3 enzyme active site 3 metabolism 3 protein secondary structure 3 Animals 2 Anti-Bacterial Agents 2 Antioxidants 2 Article 2 COVID-19 2 COVID-19 regimen 2 Cell Line, Tumor 2 Chromatography, High Pressure Liquid 2 Coumaric Acids 2 Crustacea 2 Cytidine 2