CAS No. 2757470-18-9

Batch: Purity:99.7
Ensitrelvir fumarate Chemical Structure
Chemical Structure
Check the Ensitrelvir fumarate product page for in-depth specifications, including solubility, stock solutions, MOA, and working concentrations.

Chemical Information

IUPAC Name (E)-but-2-enedioic acid;6-[(6-chloro-2-methylindazol-5-yl)amino]-3-[(1-methyl-1,2,4-triazol-3-yl)methyl]-1-[(2,4,5-trifluorophenyl)methyl]-1,3,5-triazine-2,4-dione
CAS Number 2757470-18-9
Molecular Formula

C22H17ClF3N9O2.C4H4O4

Molecular Weight (MW) 647.95
SMILES C[N]1C=NC(=N1)CN2C(=O)NC(=NC3=CC4=C[N](C)N=C4C=C3Cl)N(CC5=C(F)C=C(F)C(=C5)F)C2=O.OC(=O)\C=C\C(O)=O
InChIKey FBOCUALVLIWPNQ-WLHGVMLRSA-N

Biological Activity

Ensitrelvir fumarate (S-217622) is an orally active, non-covalent, and non-peptidic SARS-CoV-2 3C-like (3CL) protease inhibitor with an IC of. By selectively targeting the catalytic active site of 3CL protease, it blocks the cleavage of viral polyproteins required for viral assembly. This selective inhibition disrupts SARS-CoV-2 replication and suppresses downstream viral proliferation across multiple viral variants. [1]

How to Prepare Stock Solution?

Concentration Volume Mass
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Solubility

Batch:
All in vitro solubility values are batch-tested experimental data (non-literature values).
Solvent Solubility & Note
DMSO 50 mg/mL (77.16 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO. The recommended stock concentration is 10 mM in DMSO.)
Water Insoluble
Ethanol Insoluble
FAQ
Q: Why does a DMSO stock precipitate in media/saline?
A: It is caused by unheated aqueous media (supersaturation), local solvent shock, or incorrect mixing sequence.
How to fix it?
  • Preheat media/saline to 37°C.
  • Mix rapidly (pipette/vortex) upon addition.
  • For complex mixes, always add the aqueous phase last.
  • Re-dissolve minor precipitates with a 37°C water bath and sonication (≤30 min).
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Reference

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Note: Technical data last updated: Sep 1, 2026.