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638-23-3

Basic Information
CAS No.: 638-23-3
Name: L-Cysteine,S-(carboxymethyl)-
Molecular Structure:
Molecular Structure of 638-23-3 (L-Cysteine,S-(carboxymethyl)-)
Formula: C5H9NO4S
Molecular Weight: 179.21
Synonyms: Alanine,3-[(carboxymethyl)thio]-, L- (6CI,8CI);(2R)-2-Amino-3-[(carboxymethyl)thio]propionic acid;(L)-2-Amino-3-(carboxymethylthio)propionicacid;(R)-S-(Carboxymethyl)cysteine;3-[(Carboxymethyl)thio]-L-alanine;AHR3053;Bronchokod;Carbocysteine;Chilvax;L-(Carboxymethyl)cysteine;LJ 206;Lisil;Lisomucil;Loviscol;Muciclar;Mucocis;Mucodyne;Mucofan;Mucolase;Mucolex;Pectox;Pulmoclase;Reomucil;Rhinathiol;Rhinatiol;S-(Carboxymethyl)-(R)-cysteine;Siroxyl;Thiodril;Transbronchin;L-Carbocysteine(S-CMC);
EINECS: 211-327-5
Density: 1.514 g/cm3
Melting Point: 208-213 °C (dec.)
Boiling Point: 417.3 °C at 760 mmHg
Flash Point: 206.2 °C
Solubility: soluble in cold water
Appearance: white to slightly off-white amorphous powder
Hazard Symbols: IrritantXi
Risk Codes: 36/37/38
Safety: 24/25-36-26
Transport Information:
PSA: 125.92000
LogP: -0.08360
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Chemistry

IUPAC Name: 2-Amino-3-(carboxymethylsulfanyl)propanoic acid
Carbocisteine's Molecular formula: C5H9NO4
Carbocisteine's Molar mass: 179.195 g/mol
EINECS: 211-327-5
alpha: -31o (c=1, 10% NaH2CO3)
storage temp.: 2-8°C
Water Solubility of Carbocisteine (CAS NO.638-23-3): soluble in cold water
Synonyms: (l)-2-amino-3-(carboxymethylthio)propionicacid;(r)-s-(carboxymethyl)cysteine;carbocisteine;l.j.206;l-3-((carboxymethyl)thio)alanine;l-carboxymethylcysteine;rhinathiol;rinatiol  
Index of Refraction: 1.588
Surface Tension: 78 dyne/cm
Melting point: 208-213 °C (dec.)
Density: 1.514 g/cm3
Flash Point: 206.2 °C
Enthalpy of Vaporization: 73.57 kJ/mol
Boiling Point: 417.3 °C at 760 mmHg
Vapour Pressure: 3.91E-08 mmHg at 25 °C 
Appearance of Carbocisteine (CAS NO.638-23-3): white to slightly off-white amorphous powder

Uses

 Carbocisteine (CAS NO.638-23-3) is an expectorant that can be used to help relieve the symptoms of Chronic Obstructive Pulmonary Disorder COPD and bronchiectasis by allowing the sufferer to bring up sputum more easily.

Toxicity Data With Reference

1.    

ipr-rat LD50:7800 mg/kg

    NIIRDN    “Drugs in Japan. Ethical Drugs, 6th Edition 1982” Edited by Japan Pharmaceutical Information Center. 6 (1982),190.
2.    

scu-rat LD50:10,300 mg/kg

    NIIRDN    “Drugs in Japan. Ethical Drugs, 6th Edition 1982” Edited by Japan Pharmaceutical Information Center. 6 (1982),190.
3.    

orl-mus LD50:8400 mg/kg

    NIIRDN    “Drugs in Japan. Ethical Drugs, 6th Edition 1982” Edited by Japan Pharmaceutical Information Center. 6 (1982),190.
4.    

ipr-mus LD50:1433 mg/kg

    YKKZAJ    Yakugaku Zasshi. Journal of Pharmacy. 94 (1974),1419.
5.    

scu-mus LD50:9 g/kg

    NIIRDN    “Drugs in Japan. Ethical Drugs, 6th Edition 1982” Edited by Japan Pharmaceutical Information Center. 6 (1982),190.

6.  RTECS  AY4342000
RTECS#: CAS# 638-23-3: AY4342000
LD50/LC50: RTECS:
CAS# 638-23-3: Oral, mouse: LD50 = 8400 mg/kg;
Oral, rat: LD50 = >15 gm/kg;
Carcinogenicity: S-Carboxymethyl-L-cysteine - Not listed as a carcinogen by ACGIH, IARC, NTP, or CA Prop 65.
Other: The toxicological properties have not been fully investigated. See actual entry in RTECS for complete information.

Consensus Reports

Reported in EPA TSCA Inventory.

Safety Profile

Moderately toxic by intraperitoneal route. Mildly toxic by ingestion. Experimental reproductive effects. When heated to decomposition it emits toxic fumes of SOx and NOx.
Hazard Codes: IrritantXi
WGK Germany: 2
Risk Statements: 36/37/38 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 24/25-36-26
S24/25:Avoid contact with skin and eyes.
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36:Wear suitable protective clothing.

Specification

Chemical Stability: Stable under normal temperatures and pressures.
Conditions to Avoid: Incompatible materials.
Incompatibilities with Other Materials Strong oxidizing agents.
Hazardous Decomposition Products Carbon monoxide, carbon dioxide.
Hazardous Polymerization Hazardous Polymerization