Discontinued Product

Unfortunately KH CB19 (Cat. No. 4262) has been withdrawn from sale for commercial reasons.
Cat.No. 4262 - KH CB19 | C15H13Cl2N3O2 | CAS No. 1354037-26-5
Description: Selective, potent inhibitor of CLK1 and 4
Chemical Name: Ethyl 3-(2-Amino-1-cyanoethenyl)-6,7-dichloro-1-methylindole-2-carboxylate
Purity: ≥97% (HPLC)

Biological Activity

Selective, potent inhibitor of CDC2-like kinase (CLK) 1 and 4 (IC50 = 20 nM for CLK1). Suppresses serine/arginine-rich protein phosphorylation by CLKs under proinflammatory conditions. Displays selectivity over a panel of 71 protein kinases. ATP-competitive.

Technical Data

M. Wt 338.19
Formula C15H13Cl2N3O2
Storage Store at -20°C
Purity ≥97% (HPLC)
CAS Number 1354037-26-5
Smiles ClC1=C(N(C)C(C(OCC)=O)=C2/C(C#N)=C\N)C2=CC=C1Cl

The technical data provided above is for guidance only. For batch specific data refer to the Certificate of Analysis.

All Tocris products are intended for laboratory research use only.

Preparing Stock Solutions

The following data is based on the product molecular weight 338.19. Batch specific molecular weights may vary from batch to batch due to solvent of hydration, which will affect the solvent volumes required to prepare stock solutions.

Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 2.96 mL 14.78 mL 29.57 mL
5 mM 0.59 mL 2.96 mL 5.91 mL
10 mM 0.3 mL 1.48 mL 2.96 mL
50 mM 0.06 mL 0.3 mL 0.59 mL

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Product Datasheets

Certificate of Analysis / Product Datasheet
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References are publications that support the products' biological activity.

Fedorov et al (2011) Specific CLK inhibitors from a novel chemotype for regulation of alternative splicing. Chem.Biol. 18 67 PMID: 21276940

Boltzen et al (2012) Alternatively spliced tissue factor and full-length tissue factor protect cardiomyocytes against TNF-α-induced apoptosis. J.Mol.Cell.Cardiol. 52 1056 PMID: 22326437

Eisenreich et al (2013) Regulation of pro-angiogenic tissue factor expression in hypoxia-induced human lung cancer cells. Oncol.Rep. 30 462 PMID: 23604472

Knapp et al (2013) A public-private partnership to unlock the untargeted kinome. Nat.Chem.Biol. 9 3 PMID: 23238671

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Keywords: KH CB19, supplier, KHCB19, CLK1, inhibitors, inhibits, CDC2-like, kinase, CLKs, CLK4, Cdc2-like, kinases, Cdc2-like, kinases, Tocris Bioscience

Citations for KH CB19

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Literature in this Area

Tocris offers the following scientific literature in this area to showcase our products. We invite you to request* or download your copy today!

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Kinases Product Listing

A collection of over 400 products for kinase research, the listing includes inhibitors of:

  • Receptor Tyrosine Kinases
  • Protein Kinases A, C, D and G
  • PI-3 Kinase, Akt and mTOR
  • MAPK Signaling
  • Receptor Serine/Threonine Kinases