SMILES:

COC1=CN=C([N]2C=NC(=N2)C)C3=C1C(=C[N]3CO[P](O)(O)=O)C(=O)C(=O)N4CCN(CC4)C(=O)C5=CC=CC=C5
Fostemsavir Chemical Structure
Chemical Structure
Check the Fostemsavir product page for in-depth specifications, including solubility, stock solutions, MOA, and working concentrations.

Chemical Information

IUPAC Name [3-[2-(4-benzoylpiperazin-1-yl)-2-oxoacetyl]-4-methoxy-7-(3-methyl-1,2,4-triazol-1-yl)pyrrolo[2,3-c]pyridin-1-yl]methyl dihydrogen phosphate
CAS Number 864953-29-7
Molecular Formula

C25H26N7O8P
Molecular Weight (MW) 583.49
SMILES COC1=CN=C([N]2C=NC(=N2)C)C3=C1C(=C[N]3CO[P](O)(O)=O)C(=O)C(=O)N4CCN(CC4)C(=O)C5=CC=CC=C5
InChIKey SWMDAPWAQQTBOG-UHFFFAOYSA-N

How to Prepare Stock Solution?

Concentration Volume Mass
🧮 Molarity Calculator

Solubility

Batch:
All in vitro solubility values are batch-tested experimental data (non-literature values).
Solvent Solubility & Note
DMSO 100 mg/mL (171.38 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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Note: Technical data last updated: Sep 1, 2026.