C646 --- p300/CBP inhibitor

Catalog No. size PriceQuantity
M60129-2S 2 mg solid $129
M60129-10S 10mg solid $535


C646 is a potent, selective and cell-permeable p300/CBP histone acetyltransferase (HAT) inhibitor with an IC50 ~400 nM. It competes with acetyl-CoA for the p300 Lys-CoA binding pocket selectively. It blocks the growth of human melanoma, leukemia, lung, and prostate cancer cells in vitro. C646 has also been used to study the role of p300-mediated gene regulation in neuroscience. The histone acetyltransferase (HAT) p300/CBP is a transcriptional coactivator implicated in many gene regulatory pathways and protein acetylation events. C646 is a useful chemical probe to study p300/CBP HAT functions.

Product information

CAS Number: 328968-36-1

Molecular Weight: 445.42

Formula: C24H19N3O6

Chemical Name: (Z)-4-(4-((5-(4,5-dimethyl-2-nitrophenyl)furan-2-yl)methylene)-3-methyl-5-oxo-4,5-dihydro-1H-pyrazol-1-yl)benzoic acid

Smiles: CC1=CC(=C(C=C1C)C1=CC=C(/C=C2\C(=O)N(N=C\2C)C2C=CC(=CC=2)C(O)=O)O1)[N+]([O-])=O


InChi: InChI=1S/C24H19N3O6/c1-13-10-20(21(27(31)32)11-14(13)2)22-9-8-18(33-22)12-19-15(3)25-26(23(19)28)17-6-4-16(5-7-17)24(29)30/h4-12H,1-3H3,(H,29,30)/b19-12-

Technical Data

Appearance: Solid Power.

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

Solubility: DMSO up to 30 mM

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: ≥12 months 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:

C646 was used at 10 µM final concentration in various in vitro assays.

In Vivo:

C646 was dosed to mice by Alzet pumps at 0.9 mg/kg per day for 14 days.


  1. Gao XN, et al. A histone acetyltransferase p300 inhibitor C646 induces cell cycle arrest and apoptosis selectively in AML1-ETO-positive AML cells. (2013) PLoS One. 8(2):e55481
  2. Santer FR, et al. Inhibition of the acetyltransferases p300 and CBP reveals a targetable function for p300 in the survival and invasion pathways of prostate cancer cell lines. (2011) Mol Cancer Ther. 10(9):1644-55.
  3. Crump NT, et al. Dynamic acetylation of all lysine-4 trimethylated histone H3 is evolutionarily conserved and mediated by p300/CBP. (2011) Proc Natl Acad Sci USA. 108(19):7814-9.

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


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