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Bofutrelvir (FB2001) is a SARS-CoV-2 main protease Mpro inhibitor with an IC50 value of 53 nM and an EC50 value of 0.53 μM. Bofutrelvir exhibits potent antiviral efficacy against several current SARS-CoV-2 variants with EC50 values of 0.26-0.42 μM. Bofutrelvir has an additive antiviral effect when combined with Remdesivir (HY-104077)[1][2].

ChEBI: N-[(2S)-3-cyclohexyl-1-oxo-1-({(2S)-1-oxo-3-[(3S)-2-oxopyrrolidin-3-yl]propan-2-yl}amino)propan-2-yl]-1H-indole-2-carboxamide is a secondary carboxamide resulting from the formal condensation of the carboxy group of 1H-indole-2-carboxylic acid with the primary amino group of 3-cyclohexyl-N-{(2S)-1-oxo-3-[(3S)-2-oxopyrrolidin-3-yl]propan-2-yl}-L-alaninamide. It is an inhibitor of SARS coronavirus main proteinase and inhibits SARS-CoV-2 replication in cell culture (EC50 = 0.53 muM). It has a role as an EC 3.4.22.69 (SARS coronavirus main proteinase) inhibitor and an anticoronaviral agent. It is an indolecarboxamide, a member of pyrrolidin-2-ones, an aldehyde, a secondary carboxamide and an oligopeptide.

Inhibitor 11a is a COVID-19 corona virus SARS-CoV-2 inhibitor th at covalently targets the main protease (Mpro; a.k.a. 3C-like protease or 3CLpro) substrate site Cys145 (IC50 = 53 nM; 10 min pre-incubation with 30 nM SARS-CoV-2 Mpro prior to the addition of 20 μM substrate). Inhibitor 11a effectively inhibits SARS-CoV-2 replication in Vero E6 cultures (IC50 = 0.53 μM 24 h post infection with MOI = 0.05; cytotoxicity CC50 >100 μM) with good pharmacokinetic properties in mice in vivo (5 mg/kg via i.p. or i.v.).

[1] Ullrich S, Nitsche C. The SARS-CoV-2 main protease as drug target. Bioorg Med Chem Lett. 2020 Sep 1;30(17):127377. DOI:10.1016/j.bmcl.2020.127377
[2] Shang W, et al. In vitro and in vivo evaluation of the main protease inhibitor FB2001 against SARS-CoV-2. Antiviral Res. 2022 Dec;208:105450. DOI:10.1016/j.antiviral.2022.105450