Chlorzoxazone

Modify Date: 2025-08-21 15:40:52

Chlorzoxazone Structure
Chlorzoxazone structure
 Common Name Chlorzoxazone
CAS Number 95-25-0 Molecular Weight 169.565
Density 1.5±0.1 g/cm3 Boiling Point 336.9±34.0 °C at 760 mmHg
Molecular Formula C7H4ClNO2 Melting Point 191-192 °C(lit.)
MSDS Chinese USA Flash Point 157.5±25.7 °C
Symbol GHS07
GHS07		 Signal Word Warning

 Use of Chlorzoxazone


Chlorzoxazone is a centrally acting muscle relaxant used to treat muscle spasm and the resulting pain or discomfort. It acts on the spinal cord by depressing reflexes.Chlorzoxazone is currently being used as a marker substrate in vitro/vivo studies to quantify cytochrome P450 2E1 (CYP2E1) activity in humans.

 Names

Name Chlorzoxazone
Synonym More Synonyms

 Chlorzoxazone Biological Activity

Description Chlorzoxazone is a centrally acting muscle relaxant used to treat muscle spasm and the resulting pain or discomfort. It acts on the spinal cord by depressing reflexes.Chlorzoxazone is currently being used as a marker substrate in vitro/vivo studies to quantify cytochrome P450 2E1 (CYP2E1) activity in humans.
Related Catalog
References

[1]. Yamamura Y, et al. Comprehensive kinetic analysis and influence of reaction components for chlorzoxazone 6-hydroxylation in human liver microsomes with CYP antibodies. Xenobiotica. 2015 Apr;45(4):353-360.

 Chemical & Physical Properties

Density 1.5±0.1 g/cm3
Boiling Point 336.9±34.0 °C at 760 mmHg
Melting Point 191-192 °C(lit.)
Molecular Formula C7H4ClNO2
Molecular Weight 169.565
Flash Point 157.5±25.7 °C
Exact Mass 168.993057
PSA 46.26000
LogP 2.29
Vapour Pressure 0.0±0.8 mmHg at 25°C
Index of Refraction 1.674
Water Solubility 0.1 g/100 mL

 Toxicological Information

CHEMICAL IDENTIFICATION

RTECS NUMBER :
DM5250000
CHEMICAL NAME :
2-Benzoxazolinone, 5-chloro-
CAS REGISTRY NUMBER :
95-25-0
LAST UPDATED :
199701
DATA ITEMS CITED :
10
MOLECULAR FORMULA :
C7-H4-Cl-N-O2
MOLECULAR WEIGHT :
169.57
WISWESSER LINE NOTATION :
T56 BMVOJ HG

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
763 mg/kg
TOXIC EFFECTS :
Behavioral - altered sleep time (including change in righting reflex) Behavioral - muscle weakness Behavioral - ataxia
REFERENCE :
JPETAB Journal of Pharmacology and Experimental Therapeutics. (Williams & Wilkins Co., 428 E. Preston St., Baltimore, MD 21202) V.1- 1909/10- Volume(issue)/page/year: 129,75,1960
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Intraperitoneal
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
150 mg/kg
TOXIC EFFECTS :
Behavioral - altered sleep time (including change in righting reflex) Behavioral - muscle weakness Behavioral - ataxia
REFERENCE :
JPETAB Journal of Pharmacology and Experimental Therapeutics. (Williams & Wilkins Co., 428 E. Preston St., Baltimore, MD 21202) V.1- 1909/10- Volume(issue)/page/year: 129,75,1960
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
440 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
ARZNAD Arzneimittel-Forschung. Drug Research. (Editio Cantor Verlag, Postfach 1255, W-7960 Aulendorf, Fed. Rep. Ger.) V.1- 1951- Volume(issue)/page/year: 17,242,1967
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Intraperitoneal
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
50 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
NTIS** National Technical Information Service. (Springfield, VA 22161) Formerly U.S. Clearinghouse for Scientific & Technical Information. Volume(issue)/page/year: AD277-689
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Subcutaneous
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
170 mg/kg
TOXIC EFFECTS :
Behavioral - anticonvulsant
REFERENCE :
APTOA6 Acta Pharmacologica et Toxicologica. (Copenhagen, Denmark) V.1-59, 1945-86. For publisher information, see PHTOEH Volume(issue)/page/year: 19,247,1962
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Rodent - hamster
DOSE/DURATION :
662 mg/kg
TOXIC EFFECTS :
Behavioral - altered sleep time (including change in righting reflex) Behavioral - muscle weakness Behavioral - ataxia
REFERENCE :
JPETAB Journal of Pharmacology and Experimental Therapeutics. (Williams & Wilkins Co., 428 E. Preston St., Baltimore, MD 21202) V.1- 1909/10- Volume(issue)/page/year: 129,75,1960
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Intraperitoneal
SPECIES OBSERVED :
Rodent - hamster
DOSE/DURATION :
166 mg/kg
TOXIC EFFECTS :
Behavioral - altered sleep time (including change in righting reflex) Behavioral - muscle weakness Behavioral - ataxia
REFERENCE :
JPETAB Journal of Pharmacology and Experimental Therapeutics. (Williams & Wilkins Co., 428 E. Preston St., Baltimore, MD 21202) V.1- 1909/10- Volume(issue)/page/year: 129,75,1960
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Intraperitoneal
SPECIES OBSERVED :
Mammal - species unspecified
DOSE/DURATION :
550 mg/kg
TOXIC EFFECTS :
Behavioral - altered sleep time (including change in righting reflex)
REFERENCE :
CHTPBA Chimica Therapeutica. (Paris, France) V.1-8, 1965-73. For publisher information, see EJMCA5. Volume(issue)/page/year: 6,65,1971 *** NIOSH STANDARDS DEVELOPMENT AND SURVEILLANCE DATA *** NIOSH OCCUPATIONAL EXPOSURE SURVEY DATA : NOES - National Occupational Exposure Survey (1983) NOES Hazard Code - X5399 No. of Facilities: 24 (estimated) No. of Industries: 1 No. of Occupations: 1 No. of Employees: 666 (estimated) No. of Female Employees: 403 (estimated)

 Safety Information

Symbol GHS07
GHS07
Signal Word Warning
Hazard Statements H302-H315-H319-H335
Precautionary Statements P301 + P312 + P330-P305 + P351 + P338
Personal Protective Equipment dust mask type N95 (US);Eyeshields;Gloves
Hazard Codes Xi:Irritant
Risk Phrases R36/37/38
Safety Phrases S26-S36-S24/25-S37/39
RIDADR NONH for all modes of transport
WGK Germany 3
RTECS DM5250000
HS Code 2934999090

 Customs

HS Code 2934999090
Summary 2934999090. other heterocyclic compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

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 Synonyms

Myoflexin
chlorzoxazone
chloroxazone
5-chloro-2(3h)-benzoxazolone
T56 BN DOJ CQ GG
Chlorzoxazone (350 mg)
Paraflex
CHLORZOXAZONE-D3
EINECS 202-403-9
CHLORZOXANE
Biomioran
5-chloro-3H-benzooxazol-2-one
Solaxin
Myoflexine
MFCD00005717
5-Chloro-2-benzoxazolone
Chlorzoxazon
Chlorzoxazone-13C,15N,D2
5-chloro-3H-1,3-benzoxazol-2-one
5-Chlor-2-hydroxy-benzoxazol
2(3H)-Benzoxazolone, 5-chloro-
5-Chloro-1,3-benzoxazol-2(3H)-one
2(3H)-BENZOXAZOLONE,5-CHLORO-
5-CHLOROBENZOXAZOL-2-ONE
T56 BMVOJ GG
5-Chloro-2-hydroxybenzoxazole
Pathorysin
CHLOROXAZON
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Chemsrc provides Chlorzoxazone(CAS#:95-25-0) MSDS, density, melting point, boiling point, structure, formula, molecular weight etc. Articles of Chlorzoxazone are included as well.>> amp version: Chlorzoxazone

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