CAS No. 841290-81-1

Batch: Purity:99.43
R406 Chemical Structure
Chemical Structure
Check the R406 product page for in-depth specifications, including solubility, stock solutions, MOA, and working concentrations.

Chemical Information

IUPAC Name benzenesulfonic acid;6-[[5-fluoro-2-(3,4,5-trimethoxyanilino)pyrimidin-4-yl]amino]-2,2-dimethyl-4H-pyrido[3,2-b][1,4]oxazin-3-one
CAS Number 841290-81-1
Molecular Formula

C22H23FN6O5.C6H6O3S

Molecular Weight (MW) 628.63
SMILES CC1(C(=O)NC2=C(O1)C=CC(=N2)NC3=NC(=NC=C3F)NC4=CC(=C(C(=C4)OC)OC)OC)C.C1=CC=C(C=C1)S(=O)(=O)O
InChIKey UXDRJPYSTZHIOE-UHFFFAOYSA-N

Ordering Information

Biological Activity

R406 is a potent, ATP-competitive spleen tyrosine kinase (Syk) inhibitor with an IC50 of. It blocks Syk-dependent Fc receptor-mediated activation of monocytes, macrophages, and neutrophils, as well as B-cell receptor signaling in B lymphocytes. By suppressing Syk phosphorylation and downstream signaling pathways, R406 inhibits immune complex-mediated inflammation and cellular activation, ultimately reducing disease severity in preclinical models of autoimmune disorders. [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 100 mg/mL (159.07 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO. The recommended stock concentration is 10 mM in DMSO.)
Water Insoluble
Ethanol 0 mg/mL
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).

Aliquotting Service

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