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Pracinostat (SB939)

Catalog No.
Pan-HDAC inhibitor
Grouped product items
SizePriceStock Qty
10mM (in 1mL DMSO)
In stock
Evaluation Sample
In stock
In stock
In stock
In stock

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Email: [email protected]

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Pracinostat, also known as SB939, is a potent and orally available inhibitor of histone deacetylase (HDAC) with a relatively stronger selectivity (more than 1000-fold) for class I, class II and class IV HDACs rather than class III HDACs. Pracinostat potently suppresses proliferation in a wide range of cancer cell lines, including colon cancer, ovarian cancer, prostate carcinomas, acute myeloid leukaemia (AML) and B cell lymphoma. Recent study results have shown that SB939 induces the accumulation of acetylated histone H3 (AcH3) and acetylated α-tubulin and increases the expression of the cyclin dependent kinase inhibitor p21 in cancer cells.


Razak AR, Hotte SJ, Siu LL, Chen EX, Hirte HW, Powers J, Walsh W, Stayner LA, Laughlin A, Novotny-Diermayr V, Zhu J, Eisenhauer EA. Phase I clinical, pharmacokinetic and pharmacodynamic study of SB939, an oral histone deacetylase (HDAC) inhibitor, in patients with advanced solid tumours. Br J Cancer. 2011;104(5):756-762.

Product Citation

Chemical Properties

Physical AppearanceA solid
StorageStore at -20°C
Cas No.929016-96-6
SynonymsSB-939, SB 939
Solubilityinsoluble in H2O; ≥11.4 mg/mL in DMSO; ≥24.8 mg/mL in EtOH with ultrasonic
Chemical Name(E)-3-(2-butyl-1-(2-(diethylamino)ethyl)-1H-benzo[d]imidazol-5-yl)-N-hydroxyacrylamide
SDFDownload SDF
Shipping ConditionShip with blue ice, or upon other requests.
General tipsFor obtaining a higher solubility, please warm the tube at 37°C and shake it in the ultrasonic bath for a while. We do not recommend long-term storage for the solution, please use it up soon.


Cell experiment:

Cell lines

Ovarian (A2780) , colon (HCT-116), and prostate (PC-3) cell lines

Preparation method

The solubility of this compound in DMSO is >10 mM. General tips for obtaining a higher concentration: Please warm the tube at 37 °C for 10 minutes and/or shake it in the ultrasonic bath for a while.Stock solution can be stored below -20°C for several months.

Reaction Conditions

96 h; IC50=0.48±0.21 μM (A2780), 0.48±0.27 μM (HCT-116), 0.34±0.06 μM (PC-3)


SB939 showed broad anti-proliferative activity against representative tumor cells from ovarian (A2780) , colon (HCT-116), and prostate (PC-3) with cellular IC50 values of 0.48±0.21, 0.48±0.27 and 0.34±0.06 μM, respectively.

Animal experiment:

Animal models

Athymic nude mice

Dosage form

200 mg/kg, 100 mg/kg, 50 mg/kg; oral taken.


SB939 was clearly toxic at the highest dose tested (200 mg/kg); however, at the MTD dose of 100 mg/kg and at 50mg/kg, it demonstrated very significant antitumor effects on day 21 with TGI = 90% (p < 0.001 ) and 66% ( p < 0.001), respectively, with acceptable body weight loss.

Other notes

Please test the solubility of all compounds indoor, and the actual solubility may slightly differ with the theoretical value. This is caused by an experimental system error and it is normal.


[1] Wang H, Yu N, Chen D, et al. Discovery of (2 E)-3-{2-butyl-1-[2-(diethylamino) ethyl]-1 H-benzimidazol-5-yl}-N-hydroxyacrylamide (SB939), an orally active histone deacetylase inhibitor with a superior preclinical profile[J]. Journal of medicinal chemistry, 2011, 54(13): 4694-4720.

Biological Activity

Description Pracinostat (SB939) is a potent inhibitor of HDAC with IC50 of 40-140 nM with exception for HDAC6.
IC50 49 nM 43 nM 56 nM 47 nM 70 nM 40 nM

Quality Control

Chemical structure

Pracinostat (SB939)

Related Biological Data

Pracinostat (SB939)

Related Biological Data

Pracinostat (SB939)

Related Biological Data

Pracinostat (SB939)

Related Biological Data

Pracinostat (SB939)