CPI-203 Chemical Structure

CPI-203 Chemical Structure
Molecular Weight: 399.90

Validation & Quality Control

Quality Control & MSDS

Product Information

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Product Description

Biological Activity

Description CPI-203 is a potent BET bromodomain inhibitor with IC50 of 37 nM for BRD4.
Targets BRD4 [1]
IC50 37 nM
In vitro CPI203 inhibits BRD4 in vitro and in cells, while does not affect BRD4 kinase activity in vitro. [1] CPI203 exerts a cytostatic effect in all the 9 MCL cell lines analyzed with GI50 ranging from 0.06 to 0.71 μM, with low cytotoxicity in normal PBMCs from healthy donors. Furthermore, lenalidomide and CPI203, by targeting IRF4 and MYC, efficiently activates the cell death program in MCL cells resistant to bortezomib. [2]
In vivo BRD4 mediates CTD Ser2 phosphorylation in vivo. [1] In REC-1 tumor-bearing mice, the combination of lenalidomide with CPI203 (2.5 mg/kg i.p.) synergistically augments the antitumoral properties of each single agent via the abrogation of MYC and IRF4 expression and the induction of apoptosis. [2]

Protocol(Only for Reference)

Kinase Assay:


BRD4 α-screen assay The BRD4 α-screen assay is a proximity-based assay using a tetraacteylated H4 peptide and the isolated bromodomain 1 of human BRD4. IC50 values are calculated using a 10-point serial dilution of BET inhibitor.

Cell Assay:


Cell lines 2 PBMC cultures from healthy donors and 9 MCL cell lines (Granta-519, JVM-2, UPN1, Z-138, JeKo-1, ZBR, JBR, Mino, REC-1 cells)
Concentrations 10 μM
Incubation Time 72 hours

MCL primary cells and cell lines are incubated as indicated with lenalidomide and/or CPI203. MTT is added for 2-6 additional hours before spectrophotometric measurement. Each measurement is made in triplicate. Values are represented using untreated control cells. The GI50 is calculated as the concentration that produced 50 % growth inhibition. Combination indexes (CIs) are calculated by using the Calcusyn software version 2.0. The interaction between two drugs is considered synergistic when CI <1.

Animal Study:


Animal Models REC-1 tumor-bearing mice
Dosages 2.5 mg/kg twice daily
Administration i.p

Conversion of different model animals based on BSA (Value based on data from FDA Draft Guidelines)

SpeciesMouseRatRabbitGuinea pigHamsterDog
Weight (kg)
Body Surface Area (m2)0.0070.0250.
Km factor36128520
Animal A (mg/kg) = Animal B (mg/kg) multiplied by  Animal B Km
Animal A Km

For example, to modify the dose of resveratrol used for a mouse (22.4 mg/kg) to a dose based on the BSA for a rat, multiply 22.4 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for resveratrol of 11.2 mg/kg.

Rat dose (mg/kg) = mouse dose (22.4 mg/kg) ×  mouse Km(3)  = 11.2 mg/kg
rat Km(6)


[1] Devaiah BN, et al. Proc Natl Acad Sci U S A. 2012, 109(18), 6927-6932.

[2] Moros A, et al. Leukemia. 2014. doi: 10.1038/leu.2014.106.

Chemical Information

Download CPI-203 SDF
Molecular Weight (MW) 399.90


CAS No. 1446144-04-2
Storage 3 years -20℃powder
2 years -80℃in solvent
Synonyms N/A
Solubility (25°C) * In vitro DMSO 79 mg/mL warming (197.54 mM)
Ethanol 5 mg/mL (12.5 mM)
Water <1 mg/mL
In vivo
* <1 mg/ml means slightly soluble or insoluble.
* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.
Chemical Name (6S)-4-(4-chlorophenyl)-2,3,9-trimethyl-6H-Thieno[3,2-f][1,2,4]triazolo[4,3-a][1,4]diazepine-6-acetic amide

Tech Support

Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID
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