Ensitrelvir fumarate
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MedKoo CAT#: 333079

CAS#: 2757470-18-9 (fumarate)

Description: Ensitrelvir, also known as S-217622, is an antiviral drug developed by Shionogi in partnership with Hokkaido University, which acts as an orally active 3C-like protease inhibitor for the treatment of COVID-19 infection. It is taken by mouth, and has been successfully tested against the recently emerged Omicron variant. It is the first orally active non-covalent, non-peptidic, SARS-CoV-2 3CL protease inhibitor (IC50=13 nM). It became the first Japanese domestic pill to treat COVID-19, third to be regulatorally approved in Japan; in February 2022.


Chemical Structure

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Ensitrelvir fumarate
CAS# 2757470-18-9 (fumarate)

Theoretical Analysis

MedKoo Cat#: 333079
Name: Ensitrelvir fumarate
CAS#: 2757470-18-9 (fumarate)
Chemical Formula: C26H21ClF3N9O6
Exact Mass:
Molecular Weight: 647.9562
Elemental Analysis: C, 48.20; H, 3.27; Cl, 5.47; F, 8.80; N, 19.46; O, 14.81

Price and Availability

Size Price Availability Quantity
5.0mg USD 90.0 Ready to ship
10.0mg USD 150.0 Ready to ship
25.0mg USD 250.0 Ready to ship
50.0mg USD 450.0 Ready to ship
100.0mg USD 750.0 Ready to ship
200.0mg USD 1250.0 Ready to ship
500.0mg USD 2650.0 Ready to ship
1.0g USD 3650.0 Ready to ship
2.0g USD 6450.0 Ready to ship
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Related CAS #: 2647530-73-0 (free base)   2757470-18-9 (fumarate)    

Synonym: Ensitrelvir fumarate; S-217622; S 217622; S217622; Xocova;

IUPAC/Chemical Name: (E)-6-((6-chloro-2-methyl-2H-indazol-5-yl)imino)-3-((1-methyl-1H-1,2,4-triazol-3-yl)methyl)-1-(2,4,5-trifluorobenzyl)-1,3,5-triazinane-2,4-dione fumaric acid

InChi Key: FBOCUALVLIWPNQ-WLHGVMLRSA-N

InChi Code: InChI=1S/C22H17ClF3N9O2.C4H4O4/c1-32-7-12-4-18(13(23)5-17(12)30-32)28-20-29-21(36)35(9-19-27-10-33(2)31-19)22(37)34(20)8-11-3-15(25)16(26)6-14(11)24;5-3(6)1-2-4(7)8/h3-7,10H,8-9H2,1-2H3,(H,28,29,36);1-2H,(H,5,6)(H,7,8)/b;2-1+

SMILES Code: O=C(N(CC1=NN(C)C=N1)C(N/2)=O)N(CC3=CC(F)=C(F)C=C3F)C2=N\C4=CC5=CN(C)N=C5C=C4Cl.O=C(O)/C=C/C(O)=O

Appearance: Solid powder

Purity: >98% (or refer to the Certificate of Analysis)

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition: Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Solubility: To be determined

Shelf Life: >2 years if stored properly

Drug Formulation: To be determined

Stock Solution Storage: 0 - 4 C for short term (days to weeks), or -20 C for long term (months).

HS Tariff Code: 2934.99.9001

Biological target: Ensitrelvir (S-217622) fumarate is an active non-covalent, non-peptidic, SARS-CoV-2 3CL protease inhibitor (IC50=13 nM).
In vitro activity: The antiviral activities were evaluated as per their inhibitory ability of the cytopathic effects elicited in SARS-CoV-2-infected VeroE6/TMPRSS2 cells. S-217622 exhibited similar antiviral activities against all tested SARS-CoV-2 variants, including the Omicron strain, which is responsible for the current wave of the pandemic, indicating its potential broad usability as a therapeutic agent for treating COVID-19 (half-maximal effective concentration [EC50] = 0.29–0.50 μM. Antiviral activity of S-217622 against SARS-CoV (EC50 = 0.21 μM). was also comparable to that against SARS-CoV-2, where the sequence homology of 3CLpro between SARS-CoV-2 and SARS-CoV was well-conserved. S-217622 also exhibited potent antiviral activity against MERS-CoV (EC50 = 1.4 μM), HCoV-OC43 (EC90 = 0.074 μM), and HCoV-229E (EC50 = 5.5 μM). S-217622 showed no inhibitory activity against host-cell proteases, such as caspase-2, chymotrypsin, cathepsin B/D/G/L, and thrombin at up to 100 μM, suggesting its high selectivity for coronavirus proteases. S-217622 exhibited no safety concerns in vitro in studies involving ether-a-go-go-related gene inhibition, mutagenicity/clastogenicity, and phototoxicity. Reference: J Med Chem. 2022 May 12;65(9):6499-6512. https://pubmed.ncbi.nlm.nih.gov/35352927/
In vivo activity: The antiviral efficacy of S-217622 was evaluated in vivo in mice infected with SARS-CoV-2 Gamma strain. Five-week-old BALB/c mice were intranasally inoculated with SARS-CoV-2 Gamma strain (hCoV-19/Japan/TY7-501/2021), and S-217622 was administered orally as a 0.5% methylcellulose suspension immediately and 12 hours after infection. S-217622 treatment reduced the intrapulmonary viral titers dose-dependently. The mean viral titer was significantly lower in the S-217622 treatment groups than in the vehicle treatment group (2 mg/kg vs vehicle, p = 0.0289; 8, 16, and 32 mg/kg vs vehicle, p < 0.0001). Viral titers reached near the lower limit of quantification (1.80 – log10 50% tissue culture infectious dose [TCID50]/mL) at 16 and 32 mg/kg in the S-217622 treatment group. Although twice-daily treatment was applied in this mouse model, a once-daily treatment model could be applicable in clinical treatment because S-217622 showed a much lower clearance and longer elimination half-lives in nonrodents than in rodents. Reference: J Med Chem. 2022 May 12;65(9):6499-6512. https://pubmed.ncbi.nlm.nih.gov/35352927/

Solubility Data

Solvent Max Conc. mg/mL Max Conc. mM
Solubility
DMSO 0.0 0.0

Preparing Stock Solutions

The following data is based on the product molecular weight 647.9562 Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.

Recalculate based on batch purity %
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.15 mL 5.76 mL 11.51 mL
5 mM 0.23 mL 1.15 mL 2.3 mL
10 mM 0.12 mL 0.58 mL 1.15 mL
50 mM 0.02 mL 0.12 mL 0.23 mL
Formulation protocol: 1. Unoh Y, Uehara S, Nakahara K, Nobori H, Yamatsu Y, Yamamoto S, Maruyama Y, Taoda Y, Kasamatsu K, Suto T, Kouki K, Nakahashi A, Kawashima S, Sanaki T, Toba S, Uemura K, Mizutare T, Ando S, Sasaki M, Orba Y, Sawa H, Sato A, Sato T, Kato T, Tachibana Y. Discovery of S-217622, a Noncovalent Oral SARS-CoV-2 3CL Protease Inhibitor Clinical Candidate for Treating COVID-19. J Med Chem. 2022 May 12;65(9):6499-6512. doi: 10.1021/acs.jmedchem.2c00117. Epub 2022 Mar 30. PMID: 35352927; PMCID: PMC8982737. 2. McKimm-Breschkin JL, Hay AJ, Cao B, Cox RJ, Dunning J, Moen AC, Olson D, Pizzorno A, Hayden FG. COVID-19, Influenza and RSV: Surveillance-informed prevention and treatment - Meeting report from an isirv-WHO virtual conference. Antiviral Res. 2022 Jan;197:105227. doi: 10.1016/j.antiviral.2021.105227. Epub 2021 Dec 18. PMID: 34933044; PMCID: PMC8684224. 3.
In vitro protocol: 1. Unoh Y, Uehara S, Nakahara K, Nobori H, Yamatsu Y, Yamamoto S, Maruyama Y, Taoda Y, Kasamatsu K, Suto T, Kouki K, Nakahashi A, Kawashima S, Sanaki T, Toba S, Uemura K, Mizutare T, Ando S, Sasaki M, Orba Y, Sawa H, Sato A, Sato T, Kato T, Tachibana Y. Discovery of S-217622, a Noncovalent Oral SARS-CoV-2 3CL Protease Inhibitor Clinical Candidate for Treating COVID-19. J Med Chem. 2022 May 12;65(9):6499-6512. doi: 10.1021/acs.jmedchem.2c00117. Epub 2022 Mar 30. PMID: 35352927; PMCID: PMC8982737. 2. McKimm-Breschkin JL, Hay AJ, Cao B, Cox RJ, Dunning J, Moen AC, Olson D, Pizzorno A, Hayden FG. COVID-19, Influenza and RSV: Surveillance-informed prevention and treatment - Meeting report from an isirv-WHO virtual conference. Antiviral Res. 2022 Jan;197:105227. doi: 10.1016/j.antiviral.2021.105227. Epub 2021 Dec 18. PMID: 34933044; PMCID: PMC8684224.
In vivo protocol: 1. Kawaoka Y, Uraki R, Kiso M, Iida S, Imai M, Takashita E, Kuroda M, Halfmann P, Loeber S, Maemura T, Yamayoshi S, Fujisaki S, Wang Z, Ito M, Ujie M, Iwatsuki-Horimoto K, Furusawa Y, Wright R, Chong Z, Ozono S, Yasuhara A, Ueki H, Sakai Y, Li R, Liu Y, Larson D, Koga M, Tsutsumi T, Adachi E, Saito M, Yamamoto S, Matsubara S, Hagihara M, Mitamura K, Sato T, Hojo M, Hattori SI, Maeda K, Okuda M, Murakami J, Duong C, Godbole S, Douek D, Watanabe S, Ohmagari N, Yotsuyanagi H, Diamond M, Hasegawa H, Mitsuya H, Suzuki T. Characterization and antiviral susceptibility of SARS-CoV-2 Omicron/BA.2. Res Sq [Preprint].2022 Feb 24:rs.3.rs-1375091. doi: 10.21203/rs.3.rs-1375091/v1. PMID: 35233565; PMCID: PMC8887076. 2. 2. Unoh Y, Uehara S, Nakahara K, Nobori H, Yamatsu Y, Yamamoto S, Maruyama Y, Taoda Y, Kasamatsu K, Suto T, Kouki K, Nakahashi A, Kawashima S, Sanaki T, Toba S, Uemura K, Mizutare T, Ando S, Sasaki M, Orba Y, Sawa H, Sato A, Sato T, Kato T, Tachibana Y. Discovery of S-217622, a Noncovalent Oral SARS-CoV-2 3CL Protease Inhibitor Clinical Candidate for Treating COVID-19. J Med Chem. 2022 May 12;65(9):6499-6512. doi: 10.1021/acs.jmedchem.2c00117. Epub 2022 Mar 30. PMID: 35352927; PMCID: PMC8982737.

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1: Patnin S, Makarasen A, Vijitphan P, Baicharoen A, Chaivisuthangkura A, Kuno M, Techasakul S. Computational Screening of Phenylamino-Phenoxy-Quinoline Derivatives against the Main Protease of SARS-CoV-2 Using Molecular Docking and the ONIOM Method. Molecules. 2022 Mar 9;27(6):1793. doi: 10.3390/molecules27061793. PMID: 35335157; PMCID: PMC8955101.

2: Kawaoka Y, Uraki R, Kiso M, Iida S, Imai M, Takashita E, Kuroda M, Halfmann P, Loeber S, Maemura T, Yamayoshi S, Fujisaki S, Wang Z, Ito M, Ujie M, Iwatsuki-Horimoto K, Furusawa Y, Wright R, Chong Z, Ozono S, Yasuhara A, Ueki H, Sakai Y, Li R, Liu Y, Larson D, Koga M, Tsutsumi T, Adachi E, Saito M, Yamamoto S, Matsubara S, Hagihara M, Mitamura K, Sato T, Hojo M, Hattori SI, Maeda K, Okuda M, Murakami J, Duong C, Godbole S, Douek D, Watanabe S, Ohmagari N, Yotsuyanagi H, Diamond M, Hasegawa H, Mitsuya H, Suzuki T. Characterization and antiviral susceptibility of SARS-CoV-2 Omicron/BA.2. Res Sq [Preprint]. 2022 Feb 24:rs.3.rs-1375091. doi: 10.21203/rs.3.rs-1375091/v1. PMID: 35233565; PMCID: PMC8887076.

3: McKimm-Breschkin JL, Hay AJ, Cao B, Cox RJ, Dunning J, Moen AC, Olson D, Pizzorno A, Hayden FG. COVID-19, Influenza and RSV: Surveillance-informed prevention and treatment - Meeting report from an isirv-WHO virtual conference. Antiviral Res. 2022 Jan;197:105227. doi: 10.1016/j.antiviral.2021.105227. Epub 2021 Dec 18. PMID: 34933044; PMCID: PMC8684224.