≥98% (HPLC)

4-[4-[[5-(4,5-Dimethyl-2-nitrophenyl)-2-furanyl]methylene]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]benzoic acid
Empirical Formula (Hill Notation):
CAS Number:
Molecular Weight:
MDL number:
PubChem Substance ID:

Quality Level


≥98% (HPLC)



storage condition



red to brown


DMSO: >25 mg/mL

storage temp.


SMILES string




InChI key



C646 was used to study the role of p300 in chronic neuropathic pain in rats with chronic constriction injury.


5, 25 mg in glass bottle

Biochem/physiol Actions

C646 is a potent, cell permeable and selective inhibitor of p300 and CBP (p300/CBP) histone acetyltransferases. Inhibition of p300/CBP by C646 affects the activity of a variety of transcriptional factors such as NF-κB, p53 and MyoD that are associated with physiology, disease processes, hippocampal synaptic plasticity, spatial memory and contextual fear.
C646 is a competitive histone acetyltransferase (HAT) p300/CBP inhibitor with a Ki of 400 nM and is selective versus other acetyltransferases.


NONH for all modes of transport

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

Certificate of Origin

Jia Cao et al.
Nature communications, 8(1), 131-131 (2017-07-27)
Diabetes and obesity are characterized by insulin resistance and chronic low-grade inflammation. An elevated plasma concentration of lipopolysaccharide (LPS) caused by increased intestinal permeability during diet-induced obesity promotes insulin resistance in mice. Here, we show that LPS induces endoplasmic reticulum...
Liduan Zheng et al.
Scientific reports, 7(1), 8967-8967 (2017-08-23)
Recent evidence shows the emerging roles of promoter-targeting endogenous microRNAs (miRNAs) in regulating gene transcription. However, miRNAs affecting the transcription of matrix metalloproteinase 14 (MMP-14) in gastric cancer remain unknown. Herein, through integrative mining of public datasets, we identified the...
Erin M Bowers et al.
Chemistry & biology, 17(5), 471-482 (2010-06-11)
The histone acetyltransferase (HAT) p300/CBP is a transcriptional coactivator implicated in many gene regulatory pathways and protein acetylation events. Although p300 inhibitors have been reported, a potent, selective, and readily available active-site-directed small molecule inhibitor is not yet known. Here...
A R Esteves et al.
Biochimica et biophysica acta. Molecular basis of disease, 1865(8), 2008-2023 (2018-12-21)
Protein post-translational modifications (PTMs) that potentiate protein aggregation have been implicated in several neurological disorders, including Alzheimer's (AD) and Parkinson's disease (PD). In fact, Tau and alpha-synuclein (ASYN) undergo several PTMs potentiating their aggregation and neurotoxicity. Recent data posits a...
Bin Liu et al.
Cancers, 11(4) (2019-04-03)
KRAS-driven non-small cell lung cancer (NSCLC) patients have no effective targeted treatment. In this study, we aimed to investigate targeting epidermal growth factor receptor (EGFR) as a therapeutic approach in KRAS-driven lung cancer cells. We show that ablation of EGFR...
Epigenetic modifications are thought to occur through two key interconnected processes—DNA methylation and the covalent modification of histones.
Read More
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