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B9685 Sigma-Aldrich

BAY 61-3606 hydrochloride hydrate

≥98% (HPLC), powder

Synonym: 2-[[7-(3,4-Dimethoxyphenyl)imidazo[1,2-c]pyrimidin-5-yl]amino]pyridine-3-carboxamide hydrochloride

  • Empirical Formula (Hill Notation) C20H18N6O3 · xHCl · yH2O

  • Molecular Weight 390.40 (anhydrous free base basis)

  •  PubChem Substance ID 24724427

  •  NACRES NA.77



Related Categories Approved Therapeutics/Drug Candidates, B, Bayer, Bioactive Small Molecule Alphabetical Index, Bioactive Small Molecules,
Quality Level   100
assay   ≥98% (HPLC)
form   powder
potency   7.5 nM Ki
color   yellow
solubility   H2O: soluble
originator   Bayer
storage temp.   2-8°C
SMILES string   O.Cl.COc1ccc(cc1OC)-c2cc3nccn3c(Nc4ncccc4C(N)=O)n2
InChI   1S/C20H18N6O3.ClH.H2O/c1-28-15-6-5-12(10-16(15)29-2)14-11-17-22-8-9-26(17)20(24-14)25-19-13(18(21)27)4-3-7-23-19;;/h3-11H,1-2H3,(H2,21,27)(H,23,24,25);1H;1H2



BAY 61-3606 hydrochloride hydrate has been used in focal cerebral ischemia model. It has also been used to assess the effect of Syk in stroke-induced injury.


5, 25 mg in glass bottle

Biochem/physiol Actions

BAY 61-3606 helps to prevent the degranulation of freshly isolated basophils. It also prevents B cell receptor (BCR)-mediated signaling.

Spleen tyrosine kinase (Syk) inhibitor; anti-inflammatory. Syk plays a major role in inflammation pathways via receptors for the Fc portion of immunoglobulins, as well as B cell signaling. It is orally active, potent (Ki 7.5 nM), and highly selective for Syk vs other kinases (Lyn, Fyn, Src, Itk, Btk; Ki′s).

Features and Benefits

This compound is a featured product for Kinase Phosphatase Biology research. Click here to discover more featured Kinase Phosphatase Biology products. Learn more about bioactive small molecules for other areas of research at sigma.com/discover-bsm.

This compound is also offered as part of Sigma′s Library of Pharmacologically Active Compounds (LOPAC®1280), a biologically annotated collection of high-quality, ready-to-screen compounds. Click here to learn more.

This compound was developed by Bayer. To browse the list of other pharma-developed compounds and Approved Drugs/Drug Candidates, click here.

Legal Information

LOPAC is a registered trademark of Sigma-Aldrich Co. LLC

Safety & Documentation

Safety Information

Personal Protective Equipment 
NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Protocols & Articles


Discover Bioactive Small Molecules for Kinase Phosphatase Biology

Phosphorylation is a ubiquitous cellular regulatory mechanism that mediates signal transduction pathways, which carry signals from the cell surface to the nucleus or cytoplasm, by altering the activi...
Keywords: Apoptosis, Bioactive small molecules, Cancer, Diseases, Inflammation, Metabolism, Neurodegenerative Diseases, Phosphorylations, Transduction

The Role of Inflammation in Neurodegeneration

It is well established that the brain can sense and react to peripheral insults through the rapid induction of fever and other neuroendocrine changes in response to events such as infection and tissu...
Scott Hauser, Technology Transfer Specialist, Sigma® Life Science
Biofiles, Vol. 8, No. 19
Keywords: Adhesion, Central Nervous System, Diseases, Gene expression, Inflammation, Neurodegenerative Diseases, Reductions

Peer-Reviewed Papers


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