Reported in EPA TSCA Inventory.

1. Introduction of L-Cysteine hydrochloride anhydrous

L-Cysteine hydrochloride anhydrous (CAS No. 52-89-1), with the IUPAC Name of (2R)-2-Amino-3-sulfanylpropanoic acid hydrochloride, is one kind of white crystalline powder. And this chemical belongs to the Classification Code which include Drug / Therapeutic Agent; Mutation data. For being stable under normal shipping and handling conditions, this chemical is incompatible with strong oxidizing agents, metals. And the decomposition information are as below: Hydrogen chloride, nitrogen oxides, carbon monoxide, oxides of sulfur, carbon dioxide, nitrogen. 
 
2. Properties of L-Cysteine hydrochloride anhydrous

L-Cysteine hydrochloride anhydrous has the following datas: (1)Melting point: 180°C; (2)H bond acceptors: 3; (3)H bond donors: 3; (4)Freely Rotating Bonds: 4; (5)Polar Surface Area: 54.84 ?2; (6)Flash Point: 131.5 °C; (7)Enthalpy of Vaporization: 58.69 kJ/mol; (8)Boiling Point: 293.9 °C at 760 mmHg; (9)Vapour Pressure: 0.000411 mmHg at 25°C.

3. Structure Descriptors of L-Cysteine hydrochloride anhydrous

You could convert the following datas into the molecular structure:
(1). InChI: InChI=1S/C3H7NO2S.ClH/c4-2(1-7)3(5)6;/h2,7H,1,4H2,(H,5,6);1H/t2-;/m0./s1
(2). InChIKey: InChIKey=IFQSXNOEEPCSLW-DKWTVANSSA-N
(3). Smiles: C([C@H](CS)N)(O)=O.Cl

4. Toxicity of L-Cysteine hydrochloride anhydrous

Organism	Test Type	Route	Reported Dose (Normalized Dose)	Effect	Source
mouse	LD50	intraperitoneal	1250mg/kg (1250mg/kg)		National Technical Information Service. Vol. AD691-490,
mouse	LD50	intravenous	771mg/kg (771mg/kg)		Japanese Journal of Antibiotics. Vol. 38, Pg. 137, 1985.
mouse	LD50	unreported	3gm/kg (3000mg/kg)		British Journal of Cancer. Vol. 6, Pg. 160, 1952.

5. Safety Information of L-Cysteine hydrochloride anhydrous

Moderately toxic by intraperitoneal, intravenous, and possibly other routes. Mutation data reported. When heated to decomposition it emits very toxic fumes of NOx, SOx, and Cl−.
Safety Information of L-Cysteine hydrochloride (CAS NO.52-89-1)
Hazard Codes: Xi
Risk Statements: 36/37/38
R36/37/38: Irritating to eyes, respiratory system and skin.
Safety Statements: 26-36
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S36: Wear suitable protective clothing.
WGK Germany: 2
RTECS: HA2275000
F: 3-10-23

Following are some specific dangerous cases and their according measures:
Ingestion:If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
Inhalation:Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
Skin:Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
Eyes:Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.
Handling and Storage:
Storage:Keep container closed when not in use. Store in a cool, dry, well-ventilated area away from incompatible substances. Do not store in metal containers. Store protected from moisture. Store protected from light and air.
Handling:Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation. Use with adequate ventilation.

6. Use of L-Cysteine hydrochloride anhydrous

L-Cysteine hydrochloride anhydrous can be usde for the treatment of radioactive drug poisoning, heavy metal poisoning, toxic hepatitis, serum sickness, etc.,and also can prevent the liver necrosis.Besides.it is used as perm for fine cosmetics, sunscreen, germinal perfume, raise fa in composition; can be used as food additives, vitamin C to prevent oxidation and discoloration; for the bread to promote the formation of protein and fermentation of grain, out of molds.

7. Production of L-Cysteine hydrochloride anhydrous

L-Cysteine hydrochloride anhydrous can produced by using L-cystine as raw materials and using stannous chloride in hydrochloric acid medium to restore, and then derived from refined crystal.