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C4397

Sigma-Aldrich

Chlorzoxazone

Synonym(s):

5-Chloro-2(3H)-benzoxazolone, 5-Chloro-2-hydroxybenzoxazole

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About This Item

Empirical Formula (Hill Notation):
C7H4ClNO2
CAS Number:
95-25-0
Molecular Weight:
169.57
EC Number:
202-403-9
MDL number:
MFCD00005717
UNSPSC Code:
12352200
PubChem Substance ID:
24277702
NACRES:
NA.77

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.

pictograms

Exclamation mark
GHS07

signalword

Warning

Hazard Classifications

Acute Tox. 4 Oral - Eye Irrit. 2 - Skin Irrit. 2 - STOT SE 3

target_organs

Respiratory system

Storage Class

11 - Combustible Solids

wgk_germany

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

dust mask type N95 (US), Eyeshields, Gloves

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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B J Powers et al.
Archives of internal medicine, 146(6), 1183-1186 (1986-06-01)
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
Karina Alviña et al.
The Journal of neuroscience : the official journal of the Society for Neuroscience, 30(21), 7249-7257 (2010-05-28)
Episodic ataxia type-2 (EA2) is an inherited movement disorder caused by mutations in the gene encoding the Ca(v)2.1alpha1 subunit of the P/Q-type voltage-gated calcium channel that result in an overall reduction in the P/Q-type calcium current. A consequence of these
De-Li Dong et al.
European journal of pharmacology, 545(2-3), 161-166 (2006-07-25)
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
Yong-Long Han et al.
Journal of ethnopharmacology, 139(1), 104-109 (2011-11-15)
Herba Erigerontis injection (HEI), one of the most popular herbal prescription in China, is made from the aqueous extracts of Erigeron breviscapus whole plant. Now HEI is widely used for the treatment of cardiovascular diseases and cerebrovascular diseases such as
Karina Alviña et al.
The Journal of neuroscience : the official journal of the Society for Neuroscience, 30(21), 7258-7268 (2010-05-28)
Episodic ataxia type 2 (EA2) is a hereditary cerebellar ataxia associated with mutations in the P/Q-type voltage-gated calcium (Ca(2+)) channels. Therapeutic approaches for treatment of EA2 are very limited. Presently, the potassium (K(+)) channel blocker 4-aminopyridine (4-AP) constitutes the most
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