≥98% (HPLC)

6-[[2-[[4-(2,4-Dichlorophenyl)-5-(5-methyl-1H-imidazol-2-yl)-2-pyrimidinyl]amino]ethyl]amino]-3-pyridinecarbonitrile, CT99021
Empirical Formula (Hill Notation):
CAS Number:
Molecular Weight:
MDL number:
PubChem Substance ID:

Quality Level


≥98% (HPLC)




white to light brown


DMSO: 2 mg/mL, clear (warmed)

storage temp.


SMILES string


General description

CHIR99021 is an aminopyrimidine derivative. CHIR99021 promotes self-renewal potential of embryonic stem cells (ESCs) of mice by inhibiting glycogen synthase kinase-3 (GSK-3) activity and potentiates the upregulation of β-catenin and c-Myc functions. CHIR99021 promotes self-renewal of ESCs by modulating transforming growth factor β (TGF-β), Notch and mitogen-activated protein kinases (MAPK) signaling pathways. CHIR99021 is an agonist of wingless/integrated (wnt) signalling, upregulates cyclinA expression and promotes cell proliferation in non-small-cell lung cancer (NSCLC) cell lines.


CHIR99021 has been used:
  • in cocktail with small molecules to convert human lung fibroblast cells into neurons
  • as a culture medium supplement in potassium supplemented simplex optimization medium (KSOM) for the culture of blastocysts
  • for chronic inhibition of GSK-3 to investigate its role in corticogenesis


5, 25 mg in glass bottle

Biochem/physiol Actions

CHIR99021 is a very potent inhibitor of Glycogen synthase kinase 3 (GSK3, IC50 values for GSK3α and GSK3β = 10 and 6.7 nM, respectively). There is no cross-reactivity against CDKs. CHIR99201 potentiates self-renewal of human and mouse embryonic stem cells, and enhances reprogramming of somatic cells into stem cells.


Skull and crossbones

Signal Word


Hazard Statements

Target Organs

Respiratory system


UN 2811 6.1 / PGIII

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis
Certificate of Origin
The roles of Notch3 on the cell proliferation and apoptosis induced by CHIR99021 in NSCLC cell lines: a functional link between Wnt and Notch signaling pathways
Li C, et al.
PLoS ONE, 8(12), e84659-e84659 (2013)
CHIR99021 promotes self-renewal of mouse embryonic stem cells by modulation of protein-encoding gene and long intergenic non-coding RNA expression
Wu Y, et al.
Experimental Cell Research, 319(17), 2684-2699 (2013)
Co-incident insertion enables high efficiency genome engineering in mouse embryonic stem cells
Shy BR
Nucleic Acids Research, 44, 7997-8010 (2016)
Enterochromaffin Cells Are Gut Chemosensors that
Couple to Sensory Neural Pathways
Bellono NW
Cell, 170, 185-198 (2017)
Chemical conversion of human lung fibroblasts into neuronal cells
Wan XY, et al.
International Journal of Molecular Medicine, 41(3), 1463-1468 (2018)
Naive pluripotent stem cells are located within the epiblast of mature blastocysts. These primitive “ground-state” cells may be cultured in vitro using specialized media and small molecule inhibitors.
Read More
Organoid culture products to generate tissue and stem cell derived 3D brain, intestinal, gut, lung and cancer tumor organoid models.
Read More
Step-by-step culture protocols for neural stem cell culture including NSC isolation, expansion, differentiation and characterization.
Read More

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