Cyclic Pifithrin-α hydrobromide

Cat. No. 3843

Cyclic Pifithrin-a hydrobromide C16H16N2S.HBr [511296-88-1]

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Alternative Name: Pifithrin-β

Chemical Name: 5,6,7,8-Tetrahydro-2-(4-methylphenyl)-imidazo[2,1-b]benzothiazole hydrobromide

Biological Activity

Cyclic analog of pifithrin-α (Cat. No. 1267), a small molecule inhibitor of p53. Prevents dexamethasone-induced cell death in murine thymocytes (EC50 = 2.01 μM). Sensitizes p53-deficient tumors to radiotherapy and chemotherapy; increases apoptosis in target cells when used in combination with antimicrotubule agents.

Technical Data

Soluble to 100 mM in DMSO and to 10 mM in ethanol
>98 %
Desiccate at RT

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.

Certificate of Analysis / Safety Data Sheet

Certificate of Analysis: View current batch
Safety Data Sheet: View Safety Data Sheet


Barchechath et al (2005) Inhibitors of apoptosis in lymphocytes: synthesis and biological evaluation of compounds related to pifithrin-α. J.Med.Chem. 48 6409. PMID: 16190767.

Pietrancosta et al (2005) Novel cyclized Pifithrin-alpha p53 inactivators: synthesis and biological studies. Bioorg.Med.Chem.Lett. 15 1561. PMID: 15745797.

Zuco and Zunino (2008) Cyclic Pifithrin-α sensitizes wild type p53 tumor cells to antimicrotubule agent-induced apoptosis. Neoplasia 10 587. PMID: 18516295.

If you know of a relevant citation for this product please let us know.

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