C4397
Chlorzoxazone
Synonym(s):
5-Chloro-2(3H)-benzoxazolone, 5-Chloro-2-hydroxybenzoxazole
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All Photos(3)
About This Item
Empirical Formula (Hill Notation):
C7H4ClNO2
CAS Number:
Molecular Weight:
169.57
EC Number:
MDL number:
UNSPSC Code:
12352200
PubChem Substance ID:
NACRES:
NA.77
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Assay
≥98% (TLC)
form
powder
color
white to off-white
mp
191-192 °C (lit.)
solubility
DMSO: 50 mg/mL, clear
originator
Johnson & Johnson
storage temp.
room temp
SMILES string
Clc1ccc2OC(=O)Nc2c1
InChI
1S/C7H4ClNO2/c8-4-1-2-6-5(3-4)9-7(10)11-6/h1-3H,(H,9,10)
InChI key
TZFWDZFKRBELIQ-UHFFFAOYSA-N
Gene Information
human ... KCNN4(3783)
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Application
Chlorzoxazone may be used:
- as a calcium-activated potassium (KCa) channel activator in patch-clamp electrophysiology to test its effect on dendritic hyperexcitability
- as a substrate for cytochrome P450 2E1 (CYP2E1) enzyme in cultured human hepatocytes
- as a benzimidazolone compound to test its effect on epithelial sodium (Na+) transport
Biochem/physiol Actions
Chlorzoxazone inhibits the multisynaptic reflex arcs primarily in the spinal cord and brain subcortical areas. It is an activator of calcium activated potassium channels and may contribute to the aortic artery relaxation in mice. Chlorzoxazone also activates the calcium-activated potassium (KCa) channel and small conductance calcium-activated potassium channels (SK). It is metabolized by cytochrome P450 2E1 (CYP2E1) and serves as a probe for monitoring this enzyme function.
Chlorzoxazone is a skeletal muscle relaxant.
Features and Benefits
This compound is a featured product for ADME Tox research. Click here to discover more featured ADME Tox products. Learn more about bioactive small molecules for other areas of research at sigma.com/discover-bsm.
This compound is featured on the Potassium Channels page of the Handbook of Receptor Classification and Signal Transduction. To browse other handbook pages, click here.
This compound was developed by Johnson & Johnson. To browse the list of other pharma-developed compounds and Approved Drugs/Drug Candidates, click here.
Signal Word
Warning
Hazard Statements
Precautionary Statements
Hazard Classifications
Acute Tox. 4 Oral - Eye Irrit. 2 - Skin Irrit. 2 - STOT SE 3
Target Organs
Respiratory system
Storage Class Code
11 - Combustible Solids
WGK
WGK 3
Flash Point(F)
Not applicable
Flash Point(C)
Not applicable
Personal Protective Equipment
dust mask type N95 (US), Eyeshields, Gloves
Certificates of Analysis (COA)
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A drug rechallenge proved chlorzoxazone to be hepatotoxic in a patient who had been treated with a combination of it and acetaminophen (Parafon Forte) for several months. Failure to demonstrate a toxic response to acetaminophen coupled with a dramatic response
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Chlorzoxazone has been reported to activate the intermediate-conductance, Ca(2+)-activated K(+) channels in aortic endothelial cells and to relax the artery. The aim of the present study was to characterize the chlorzoxazone-induced relaxation of rat thoracic artery. Chlorzoxazone did not affect
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