CAS No. 1884712-47-3

Batch: Purity:99.95
CPI-637 Chemical Structure
Chemical Structure
Check the CPI-637 product page for in-depth specifications, including solubility, stock solutions, MOA, and working concentrations.

Chemical Information

IUPAC Name (4R)-4-methyl-6-[1-methyl-3-(1-methylpyrazol-4-yl)indazol-5-yl]-1,3,4,5-tetrahydro-1,5-benzodiazepin-2-one
CAS Number 1884712-47-3
Molecular Formula

C22H22N6O

Molecular Weight (MW) 386.45
SMILES CC1CC(=O)NC2=CC=CC(=C2N1)C3=CC4=C(C=C3)N(N=C4C5=CN(N=C5)C)C
InChIKey BFTKDWYIRJGJCA-CYBMUJFWSA-N

Ordering Information

Biological Activity

CPI-637 is a selective, cell-active benzodiazepinone bromodomain inhibitor of CBP (IC50 0.03 μM) and EP300 (IC50 0.051 μM). It exhibits high selectivity across the bromodomain family, demonstrating minor biochemical off-target activity only against BRD9. By blocking the interaction of CBP and EP300 with acetylated histones, CPI-637 suppresses chromatin reading and downstream transcriptional activation, leading to suppressed cellular proliferation and altered gene expression in cancer models. [1]

How to Prepare Stock Solution?

Concentration Volume Mass
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Solubility

Batch:
All in vitro solubility values are batch-tested experimental data (non-literature values).
Solvent Solubility & Note
DMSO 26 mg/mL (67.27 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO. The recommended stock concentration is 10 mM in DMSO.)
Water Insoluble
Ethanol Insoluble
FAQ
Q: Why does a DMSO stock precipitate in media/saline?
A: It is caused by unheated aqueous media (supersaturation), local solvent shock, or incorrect mixing sequence.
How to fix it?
  • Preheat media/saline to 37°C.
  • Mix rapidly (pipette/vortex) upon addition.
  • For complex mixes, always add the aqueous phase last.
  • Re-dissolve minor precipitates with a 37°C water bath and sonication (≤30 min).

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Note: Technical data last updated: Sep 1, 2026.