CAS No. 204255-11-8

Batch: Purity:99.99
Oseltamivir Phosphate  Chemical Structure
Chemical Structure
Check the Oseltamivir Phosphate product page for in-depth specifications, including solubility, stock solutions, MOA, and working concentrations.

Chemical Information

IUPAC Name ethyl (3R,4R,5S)-4-acetamido-5-amino-3-pentan-3-yloxycyclohexene-1-carboxylate;phosphoric acid
CAS Number 204255-11-8
Molecular Formula

C16H28N2O4.H3PO4

Molecular Weight (MW) 410.4
SMILES CCC(CC)OC1C=C(CC(C1NC(=O)C)N)C(=O)OCC.OP(=O)(O)O
InChIKey PGZUMBJQJWIWGJ-ONAKXNSWSA-N

Biological Activity

Oseltamivir phosphate is a prodrug that is hepatically converted into its active metabolite, oseltamivir carboxylate, a potent and selective inhibitor of influenza viral neuraminidase. By competitively targeting neuraminidase, it prevents the enzymatic cleavage of terminal sialic acid residues on host cell surfaces. This blockade impairs the release of newly formed viral particles from infected cells and suppresses viral replication and dissemination. [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 82 mg/mL (199.8 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.