Chemical. CAS: 1809249-37-3. Formula: C27H35N6O8P. MW: 602.6. Remdesivir is a adenosine triphosphate analog with broad-spectrum antiviral activity. It is a prodrug that metabolizes into its active form GS-441524. GS-441524 is an adenosine nucleotide analog in viral RNA production. It is a nucleotide analog inhibitor of RNA-dependent RNA polymerases (RdRps). The compound interferes with the action of viral RNA polymerase and evades proofreading by viral exoribonuclease (ExoN), causing a decrease in viral RNA production (RNA synthesis arrest), either by terminating RNA chains or causing mutations. It inhibits MERS-CoV or SARS-CoV-infected HAE cultures (EC50=74nM and 69nM) and murine hepatitis virus (MHV) (EC50=30nM). Remdesivir is effective in the control of 2019-nCoV (COVID-19) infection in vitro. It now also has been studied as potential treatment of SARS-CoV-2 infections.