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| Formula | C21H30N3NaO8S | 
| Molar mass | 507.53 g·mol−1 | 
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GC376 is a broad-spectrum antiviral medication under development by the biopharmaceutical company Anivive Lifesciences for therapeutic uses in humans and animals. [1] Anivive licensed the exclusive worldwide patent rights to GC376 from Kansas State University. [2] As of 2020, GC376 is being investigated as a treatment for COVID-19. [3] GC376 shows activity against many human and animal viruses, including coronavirus and norovirus; [4] the most extensive research has been multiple in vivo studies in cats treating a coronavirus, which causes deadly feline infectious peritonitis. [5] Other research supports use in porcine epidemic diarrhea virus. [6]
 Since GC376 shows broad-spectrum activity against coronavirus, [7] early on during the pandemic of 2020, it was suggested as a potential treatment for COVID-19. [8] In response to the crisis, researchers at the University of Arizona published in vitro research indicating GC376 is highly active against 3CLpro in SARS-CoV-2 (the coronavirus which causes COVID-19). [9] Another group of virologists at the University of Alberta led by D. Lorne Tyrrell then released a separate publication confirming GC376's activity against 3CLpro in SARS-CoV-2 and also indicating GC376 had a potent antiviral effect.
GC376 is a protease inhibitor. It blocks 3CLpro, a protease common to many (+)ssRNA viruses, thereby preventing the viral polyprotein from maturing into its functional parts. Chemically, GC376 is the bisulfite adduct of the aldehyde GC373, and it behaves as a prodrug for that compound. This aldehyde forms a covalent bond with the cysteine-144 residue at the protease's active site, giving a monothioacetal and blocking the enzyme's normal function. [6] [10]