Pifithrin-α, p-Nitro, Cyclic

Catalog No. Size PriceQuantity
M12802-2 2mg solid $110
M12802-10 10mg solid $330


Pifithrin-α, p-Nitro, Cyclic (PFN-α) is cell-permeable and active-form p53 inhibitor. Pifithrin-α, p-Nitro, Cyclic is one order magnitude more active than Pifithrin-α in protecting cortical neurons exposed to Etoposide (ED50=30 nM). Pifithrin-α, p-Nitro, Cyclic behaves as a p53 posttranscriptional activity inhibitor. Pifithrin-α, p-Nitro, Cyclic do not prevent p53 phosphorylation on the S15 residue.

Product information

CAS Number: 60477-38-5

Molecular Weight: 299.35

Formula: C15H13N3O2S



Chemical Name: 4-(4-nitrophenyl)-7-thia-2, 5-diazatricyclo[, ]dodeca-1(8), 3, 5-triene

Smiles: [O-][N+](=O)C1C=CC(=CC=1)C1=CN2C(=N1)SC1CCCCC2=1


InChi: InChI=1S/C15H13N3O2S/c19-18(20)11-7-5-10(6-8-11)12-9-17-13-3-1-2-4-14(13)21-15(17)16-12/h5-9H,1-4H2

Technical Data

Appearance: Solid Power

Purity: ≥98% (or refer to the Certificate of Analysis)

Solubility: DMF : 12.5 mg/mL (41.76 mM; Need ultrasonic) DMSO : 5 mg/mL (16.70 mM; Need ultrasonic)

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical or refer to Certificate of Analysis

Storage Condition: Dry, dark and -20 oC for 1 year or refer to the Certificate of Analysis.

Shelf Life: ≥360 days if stored properly.

Stock Solution Storage: 0 - 4 oC for 1 month or refer to the Certificate of Analysis.

Drug Formulation: To be determined

HS Tariff Code: 382200

How to use

In Vitro:

Pifithrin-α, p-Nitro, Cyclic (PFN-α) efficiently blocks p53-triggered cell death and p21/WAF1 expression in cortical neurons exposed to etoposide at concentrations one order magnitude lower than that in PFT-α.

In Vivo:

Intraocular injection of pifithrin-α slightly increases survival of retinal ganglion cell (RGC) at the concentration of 6 μM but not at 0.06 μM. Pifithrin-α, p-Nitro, Cyclic (PFN-α) is not effective in vivo, even at 6 μM. Pifithrin-α, p-Nitro, Cyclic shows the half-life (t1/2) of 6 hours (when incubated in biological conditions).


  1. Pietrancosta N, et al. Imino-tetrahydro-benzothiazole derivatives as p53 inhibitors: discovery of a highly potent in vivo inhibitor and its action mechanism. J Med Chem. 2006 Jun 15;49(12):3645-52.
  2. Dinca EB, et al. p53 Small-molecule inhibitor enhances temozolomide cytotoxic activity against intracranial glioblastoma xenografts. Cancer Res. 2008 Dec 15;68(24):10034-9.

Products are for research use only. Not for human use.

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