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Cat. No. M1767
R-406 Structure

R406 free base

Size Price Availability Quantity
Free Sample (0.5-1 mg)  USD 0 In stock
10mM*1mL in DMSO USD 80  USD80 In stock
1mg USD 45  USD45 In stock
5mg USD 75  USD75 In stock
10mg USD 125  USD125 In stock
50mg USD 420  USD420 In stock
100mg USD 650  USD650 In stock
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Quality Control & Documentation
Biological Activity

R406 is an orally bioavailable and selective inhibitor of spleen tyrosine kinase (Syk) with the IC50 of 41nM and Ki value of 30 nM. R406 is an active component of its prodrug R788 or R935788 (Fostamatinib).

Product Citations
Customer Product Validations & Biological Datas
Source Molecular Medicine Reports (2018). Figure 5. R406 (Abmole Bioscience)
Method HBZY - 1 cell model establishment
Cell Lines HBZY - 1 cell
Concentrations 1.5 µg/ml
Incubation Time 48 h
Results The inhibitor R406 inhibited the LPS-induced activation of the Syk/Ras/c-Fos signaling pathway.
Source Molecular Medicine Reports (2018). Figure 4. R406 (Abmole Bioscience)
Method HBZY - 1 cell model establishment
Cell Lines HBZY - 1 cell
Concentrations 1.5 µg/ml
Incubation Time 48 h
Results Furthermore, R406 was revealed to inhibit the LPS-induced activation of the Syk/Ras/c-Fos signaling pathway.
Protocol (for reference only)
Cell Experiment
Cell lines CLL cells
Preparation method To evaluate the effect of BCR stimulation on CLL cell viability, CLL cells (107/mL) were incubated in complete RPMI medium (control) or in complete medium supplemented with 10 μg/mL anti-IgM (polyclonal goat F(ab′)2 fragments to human IgM [MP Biomedicals] at 37°C in 5% CO2). After 24 and 48 hours, CLL cell viability was measured by analysis of mitochondrial transmembrane potential by 3,3 dihexyloxocarbocyanine iodine (DiOC6; Invitrogen-Molecular Probes) and cell membrane permeability to propidium iodide (PI; Molecular Probes), as described.13 Briefly, 200 μL cell suspension was collected at the indicated time points and transferred to fluorescence-activated cell sorter tubes containing 200 μL of 60 nM DiOC6 and 2 μg/mL PI in RPMI with 0.5% bovine serum albumin. Cells were then incubated at 37°C for 15 minutes and analyzed within 30 minutes by flow cytometry on a FACSCalibur (BD Biosciences).
Concentrations 5 μM
Incubation time 24 and 48 h
Animal Experiment
Animal models K/BxN Model in C57BL/6 mice
Formulation 35% TPGS, 60% PEG 400, and 5% propylene glycol
Dosages b.i.d for 13 days
Administration orally
Chemical Information
Molecular Weight 470.45
Formula C22H23FN6O5
CAS Number 841290-80-0
Solubility (25°C) DMSO 11 mg/mL
Storage Powder          -20°C   3 years ;  4°C   2 years
In solvent       -80°C   6 months ;  -20°C   1 month
Conversion of different model animals based on BSA (PMID: 27057123)
Species Mouse Rat Rabbit Guinea pig Hamster Dog
Weight (kg) 0.02 0.15 1.8 0.4 0.08 10
Body Surface Area (m2) 0.007 0.025 0.15 0.05 0.02 0.5
Km factor 3 6 12 8 5 20
Animal A (mg/kg) = Animal B (mg/kg) multiplied by  Animal B Km
Animal A Km

For example, to modify the dose of Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for Compound A of 10 mg/kg.


[1] Quiroga MP, et al. Blood. B-cell antigen receptor signaling enhances chronic lymphocytic leukemia cell migration and survival: specific targeting with a novel spleen tyrosine kinase inhibitor, R406.

[2] Bajpai M. IDrugs. Fostamatinib, a Syk inhibitor prodrug for the treatment of inflammatory diseases.

[3] Braselmann S, et al. J Pharmacol Exp Ther. R406, an orally available spleen tyrosine kinase inhibitor blocks fc receptor signaling and reduces immune complex-mediated inflammation.

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Abmole Inhibitor Catalog

Keywords: R-406, R406 free base supplier, Syk, inhibitors, activators

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