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.).
Bofutrelvir (100 and 200 mg/kg; i.p. once daily on day 0 and twice daily on day 1, 2 and 3 for 4 consecutive days) effectively against SARS-CoV-2 delta variant infection in vivo[2].
| Animal Model: | K18-hACE2 mice with SARS-CoV-2 delta variant infection[2] |
| Dosage: | 100 and 200 mg/kg |
| Administration: |
Intraperitoneal injection; 100 and 200 mg/kg once daily on day 0 and twice daily on day 1, 2 and 3 for 4 consecutive days |
| Result: | Showed a dose-dependent efficacy to virus titers of lung. Effectively reduces the lung viral loads. Dose-dependently showed antiviral activity against the SARS-CoV-2 Delta variant and significantly reduced viral load in mouse lung and brain.
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[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
![1H-Indole-2-carboxamide, N-[(1S)-1-(cyclohexylmethyl)-2-[[(1S)-1-formyl-2-[(3S)-2-oxo-3-pyrrolidinyl]ethyl]amino]-2-oxoethyl]- Structure](/CAS/20200611/GIF/2103278-86-8.gif)
