Product Name

  • Name

    L-Cysteine hydrochloride anhydrous

  • EINECS 200-157-7
  • CAS No. 52-89-1
  • Article Data8
  • CAS DataBase
  • Density
  • Solubility soluble in water
  • Melting Point 180 ºC
  • Formula C3H8ClNO2S
  • Boiling Point 293.9 ºC at 760 mmHg
  • Molecular Weight 157.621
  • Flash Point 131.5 ºC
  • Transport Information
  • Appearance white solid
  • Safety 26-36
  • Risk Codes 36/37/38
  • Molecular Structure Molecular Structure of 52-89-1 (L-Cysteine hydrochloride anhydrous)
  • Hazard Symbols IrritantXi
  • Synonyms (R)-Cysteine hydrochloride;Cysteine monohydrochloride;3-Mercaptoalanine hydrochloride;Cysteine chlorohydrate;(2R)-2-amino-3-sulfanyl-propanoic acid hydrochloride;Cysteine, L-, monohydrochloride;L-(+ )-Cysteine hydrochloride;L-Cysteine HCl Anhydrous;L-Cysteine HCl Anhy;(R)-Cysteine-hydrochloride;L-(+)-Cysteine hydrochloride;L-2-Amino-3-mercaptopropanoic acid monohydrochloride;H-Cys-OH.HCl;L- Cysteine Hydrochloride Anhydrous;L-Cysteine hydrochloride monohydrate;L-Cysteine HCL anhydrouse;
  • PSA 102.12000
  • LogP 0.83040

Synthetic route

(3R)-2-methyl-4,5-dihydrothiazole-4-carboxylic acid methyl ester
2519-89-3, 6436-58-4, 15263-39-5, 45789-42-2

(3R)-2-methyl-4,5-dihydrothiazole-4-carboxylic acid methyl ester

l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

Conditions
ConditionsYield
With hydrogenchloride; water for 24h; Inert atmosphere; Reflux;94%
N-(tert-butoxycarbonyl)-S-(N-methylcarbamoyl)cysteine methyl ester
120033-48-9

N-(tert-butoxycarbonyl)-S-(N-methylcarbamoyl)cysteine methyl ester

A

l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

B

S-(N-methylcarbamoyl)cysteine hydrochloride
120033-46-7

S-(N-methylcarbamoyl)cysteine hydrochloride

Conditions
ConditionsYield
With hydrogenchloride for 168h;A 15%
B 83%
S-(diphenyl-4-pyridylmethyl)-L-cysteine
62982-12-1

S-(diphenyl-4-pyridylmethyl)-L-cysteine

A

diphenyl(pyridin-4-yl)methanol
1620-30-0

diphenyl(pyridin-4-yl)methanol

B

l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

Conditions
ConditionsYield
With mercury(II) diacetate In water; acetic acid for 0.25h; Product distribution; other reagent (zinc dust, 80percent acetic acid, 15 min);
cycloforskamide
1447695-69-3

cycloforskamide

A

C5H9NO2*ClH

C5H9NO2*ClH

B

l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

C

L-valine hydrochloride
17498-50-9, 25616-14-2, 31320-20-4

L-valine hydrochloride

D

L-isoleucine hydrochloride
17694-98-3

L-isoleucine hydrochloride

E

L-threonine methyl ester hydrochloride
60143-52-4, 71264-40-9, 82650-07-5, 97347-46-1, 100157-61-7

L-threonine methyl ester hydrochloride

F

D-alloisoleucine hydrochloride

D-alloisoleucine hydrochloride

Conditions
ConditionsYield
With hydrogenchloride; water at 110℃; for 24h;
...Expand
l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

benzaldehyde
100-52-7

benzaldehyde

(4R)-2-phenyl-1,3-thiazolidine-4-carboxylic acid
196930-46-8

(4R)-2-phenyl-1,3-thiazolidine-4-carboxylic acid

Conditions
ConditionsYield
Stage #1: l-cysteine hydrochloride With sodium hydroxide In water
Stage #2: benzaldehyde In ethanol; water at 20℃; for 3h;		100%
With potassium acetate In methanol; water at 0 - 25℃; for 6h;98%
Stage #1: l-cysteine hydrochloride With potassium carbonate In water
Stage #2: benzaldehyde In methanol; water at 25℃; for 3h;		98%
(9H-fluoren-9-yl)methyl 4-methylbenzenesulfonaye
71532-40-6

(9H-fluoren-9-yl)methyl 4-methylbenzenesulfonaye

l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

(R)-9H-fluorenyl-9-methyl-L-cysteine
84888-38-0

(R)-9H-fluorenyl-9-methyl-L-cysteine

Conditions
ConditionsYield
With N-ethyl-N,N-diisopropylamine In N,N-dimethyl-formamide100%
formaldehyd
50-00-0

formaldehyd

l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

(R)-thiazolidine-4-carboxylic acid hydrochloride
67089-84-3

(R)-thiazolidine-4-carboxylic acid hydrochloride

Conditions
ConditionsYield
at 20℃; for 1h; Solid phase reaction; cyclocondensation;100%
Stage #1: formaldehyd; l-cysteine hydrochloride With sodium hydroxide In water at 20℃; for 24h;
Stage #2: With pyridine In ethanol; water at 0℃;		80%
l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

benzonitrile
100-47-0

benzonitrile

(4R)-2-phenyl-4,5-dihydro-1,3-thiazole-4-carboxylic acid
19983-15-4, 116179-34-1, 62096-93-9

(4R)-2-phenyl-4,5-dihydro-1,3-thiazole-4-carboxylic acid

Conditions
ConditionsYield
With sodium hydrogencarbonate In methanol at 70℃; pH=7; aq. phosphate buffer; Inert atmosphere;99%
With sodium hydrogencarbonate In methanol; aq. phosphate buffer for 72h; pH=6; Reflux;73%
With piperidine; sodium hydrogencarbonate In ethanol
Methoxycarbonylsulfenyl chloride
26555-40-8

Methoxycarbonylsulfenyl chloride

l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

S-(methoxycarbonylsulfenyl)cysteine hydrochloride

S-(methoxycarbonylsulfenyl)cysteine hydrochloride

Conditions
ConditionsYield
With hydrogenchloride In methanol at 0℃; for 1h;99%
salicylonitrile
611-20-1

salicylonitrile

l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

(R)-2-(2-hydroxyphenyl)-4,5-dihydro-1,3-thiazole-4-carboxylic acid
115921-06-7

(R)-2-(2-hydroxyphenyl)-4,5-dihydro-1,3-thiazole-4-carboxylic acid

Conditions
ConditionsYield
With sodium hydrogencarbonate In methanol; aq. phosphate buffer for 72h; pH=6; Reflux;99%
Stage #1: salicylonitrile; l-cysteine hydrochloride With sodium hydrogencarbonate In ethanol for 0.5h; Heating;
Stage #2: With piperidine In ethanol for 12h; pH=9; Heating;
Stage #3: With hydrogenchloride In ethanol pH=1.5;		67%
benzyl (E)-3-((2-cyanobenzo[d]thiazol-6-yl)thio)acrylate

benzyl (E)-3-((2-cyanobenzo[d]thiazol-6-yl)thio)acrylate

l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

(S)-2-(6-mercaptobenzo[d]thiazol-2-yl)-4,5-dihydrothiazole-4-carboxylic acid

(S)-2-(6-mercaptobenzo[d]thiazol-2-yl)-4,5-dihydrothiazole-4-carboxylic acid

Conditions
ConditionsYield
With potassium carbonate In water; dimethyl sulfoxide at 20℃; for 0.166667h; Inert atmosphere;99%
furfural
98-01-1

furfural

l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

(2RS,4R)-furan-2-yl-thiazolidine-4-carboxylic acid
72678-98-9

(2RS,4R)-furan-2-yl-thiazolidine-4-carboxylic acid

Conditions
ConditionsYield
With sodium hydrogencarbonate In ethanol; water for 6h;98%
With sodium acetate In ethanol; water at 25℃; for 3h;87%
With ethanol; potassium acetate
triphenylmethyl alcohol
76-84-6

triphenylmethyl alcohol

l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

S-trityl-L-cysteine
2799-07-7

S-trityl-L-cysteine

Conditions
ConditionsYield
Stage #1: triphenylmethyl alcohol; l-cysteine hydrochloride With trifluoroacetic acid for 2h;
Stage #2: With sodium acetate; sodium hydroxide In diethyl ether; water at 0℃; pH=5 - 6;		98%
With trifluoroacetic acid for 3h; Inert atmosphere;96%
With choline chloride; urea In trifluoroacetic acid at 25℃; for 2h;95%
l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

acetonitrile
75-05-8

acetonitrile

sodium 2-methyl-2-thiazolin-4-carboxylate

sodium 2-methyl-2-thiazolin-4-carboxylate

Conditions
ConditionsYield
With sodium ethanolate In ethanol for 11h; Heating;98%
l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

phenyl chloroformate
1885-14-9

phenyl chloroformate

2-oxothiazolidine-4(R)-carboxylic acid
19771-63-2

2-oxothiazolidine-4(R)-carboxylic acid

Conditions
ConditionsYield
With sodium hydroxide In toluene at 40℃; for 2h;98%
Stage #1: l-cysteine hydrochloride With sodium hydroxide In water at 0 - 9℃;
Stage #2: phenyl chloroformate In water; toluene at 25℃; for 2h;		71%
With sodium hydroxide In water; toluene at 0 - 30℃; for 2h;
With hydrogenchloride; sodium hydroxide In water; toluene at 25℃; for 2h; pH=1;
l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

3-(3-tert-butoxycarbonylamino)benzonitrile
145878-50-8

3-(3-tert-butoxycarbonylamino)benzonitrile

C15H18N2O4S
1401249-37-3

C15H18N2O4S

Conditions
ConditionsYield
With sodium hydrogencarbonate In methanol; aq. phosphate buffer for 72h; pH=6; Reflux;98%
pentafluorobenzenesulfenyl chloride
27918-31-6

pentafluorobenzenesulfenyl chloride

l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

((pentafluorophenyl)disulfanyl)cysteine

((pentafluorophenyl)disulfanyl)cysteine

Conditions
ConditionsYield
In acetic acid at 70℃; for 3.5h;98%
pentafluorobenzenesulfenyl chloride
27918-31-6

pentafluorobenzenesulfenyl chloride

l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

S-(pentafluorophenylsulfanyl)-L-cysteine

S-(pentafluorophenylsulfanyl)-L-cysteine

Conditions
ConditionsYield
With acetic acid In acetic acid at 70℃; for 3.5h;98%
l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

7β-chloroacetamido-7α-methoxy-3-(1-methyl-1H-tetrazole-5-mercaptomethyl)-3-cephem-4-carboxylic acid
57617-09-1

7β-chloroacetamido-7α-methoxy-3-(1-methyl-1H-tetrazole-5-mercaptomethyl)-3-cephem-4-carboxylic acid

(6R,7S)-7-[(S)-2-(2-amino-2-carboxyethylmercapto)acetamido]-7-methoxy-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate
75498-96-3

(6R,7S)-7-[(S)-2-(2-amino-2-carboxyethylmercapto)acetamido]-7-methoxy-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate

Conditions
ConditionsYield
With ethylenediaminetetraacetic acid; sodium thiosulfate In water at 50℃; Concentration; Temperature;97.9%
C85H141N7O43S

C85H141N7O43S

l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

C82H142N8O45S

C82H142N8O45S

Conditions
ConditionsYield
With tris-(2-carboxyethyl)-phosphine hydrochloride In water at 20℃; for 3h; pH=Ca. 7;97%
l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

4-cyanobenzaldehyde
105-07-7

4-cyanobenzaldehyde

(2RS,4R)-2-(4-cyano-phenyl)-thiazolidine-4-carboxylic acid
280108-15-8

(2RS,4R)-2-(4-cyano-phenyl)-thiazolidine-4-carboxylic acid

Conditions
ConditionsYield
With sodium hydrogencarbonate In ethanol; water for 6h;96%
With sodium hydroxide In ethanol; water63%
With potassium acetate In methanol; water at 20℃;
l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

2-nitro-benzaldehyde
552-89-6

2-nitro-benzaldehyde

(2RS,4R)-2-(2-nitro-phenyl)-thiazolidine-4-carboxylic acid
72693-56-2, 112928-36-6, 112928-37-7

(2RS,4R)-2-(2-nitro-phenyl)-thiazolidine-4-carboxylic acid

Conditions
ConditionsYield
With sodium hydrogencarbonate In ethanol; water for 6h;96%
With sodium hydrogencarbonate In water; dimethyl sulfoxide at 20℃;91%
(2S)-2-[(tert-butyloxycarbonyl)amino]thiopropionic acid S-phenyl ester
92645-20-0

(2S)-2-[(tert-butyloxycarbonyl)amino]thiopropionic acid S-phenyl ester

l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

N-(tert-butoxycarbonyl)-L-alanyl-L-cysteine
86810-06-2

N-(tert-butoxycarbonyl)-L-alanyl-L-cysteine

Conditions
ConditionsYield
Stage #1: l-cysteine hydrochloride With sodium tetrahydroborate In methanol at 20℃; for 1h; Inert atmosphere;
Stage #2: (2S)-2-[(tert-butyloxycarbonyl)amino]thiopropionic acid S-phenyl ester In methanol at 20℃; Inert atmosphere;		96%
Stage #1: l-cysteine hydrochloride With sodium tetrahydroborate In methanol for 1h; Inert atmosphere;
Stage #2: (2S)-2-[(tert-butyloxycarbonyl)amino]thiopropionic acid S-phenyl ester In methanol
l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

2-nitrophenylmethyl bromide
3958-60-9

2-nitrophenylmethyl bromide

S-(2-nitrobenzyl)-L-cysteine

S-(2-nitrobenzyl)-L-cysteine

Conditions
ConditionsYield
With sodium hydroxide In water; acetonitrile at 20℃; for 1h; Inert atmosphere;96%
l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

chloroacetic acid
79-11-8

chloroacetic acid

carbocisteine
638-23-3

carbocisteine

Conditions
ConditionsYield
With ammonia; ammonium bicarbonate In water at 20 - 50℃; for 0.5h; pH=7.5; Reagent/catalyst; Temperature; pH-value; Large scale;96%
2-cyano-6-aminobenzothiazole
7724-12-1

2-cyano-6-aminobenzothiazole

l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

potassium (S)-2-(6-aminobenzo[d]thiazol-2-yl) -4,5-dihydrothiazole-4-carboxylate

potassium (S)-2-(6-aminobenzo[d]thiazol-2-yl) -4,5-dihydrothiazole-4-carboxylate

Conditions
ConditionsYield
Stage #1: 2-cyano-6-aminobenzothiazole; l-cysteine hydrochloride In methanol; water at 20℃; for 0.0833333h; Inert atmosphere;
Stage #2: With potassium carbonate In methanol; water for 0.666667h; Inert atmosphere;		96%
l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

salicylaldehyde
90-02-8

salicylaldehyde

(2RS,4R)-2-(2-hydroxy-phenyl)-thiazolidine-4-carboxylic acid
201942-90-7

(2RS,4R)-2-(2-hydroxy-phenyl)-thiazolidine-4-carboxylic acid

Conditions
ConditionsYield
With sodium hydrogencarbonate In ethanol; water for 6h;95%
With sodium hydrogencarbonate In water; dimethyl sulfoxide at 20℃;78%
With ethanol; alkali cetate
With ethanol; alkali cetate
With sodium acetate In ethanol; water at 20℃; for 24h;
3-phenylpropyl isothiocyanate
2627-27-2

3-phenylpropyl isothiocyanate

l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

S--L-cysteine
137915-13-0

S--L-cysteine

Conditions
ConditionsYield
With sodium hydroxide In ethanol; water for 48h; Ambient temperature;95%
l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

hematoporphyrin IX dihydrochloride
17696-69-4

hematoporphyrin IX dihydrochloride

porphyrin c

porphyrin c

Conditions
ConditionsYield
With L-valine; acetic acid for 0.666667h; Ambient temperature;95%
With hydrogen bromide glacial acetic acid, 21 deg C, 40 min; heating 45 min, 0.01 mm Hg;95%
l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

acetone
67-64-1

acetone

2,2-dimethyl-thiazolidine-4(R)-carboxylic acid
58166-38-4

2,2-dimethyl-thiazolidine-4(R)-carboxylic acid

Conditions
ConditionsYield
for 3.5h; Reflux;95%
for 1.5h; Heating / reflux;92%
for 6h; Reflux;88%
(4-methylphenyl)diphenylmethanol
5440-76-6

(4-methylphenyl)diphenylmethanol

l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

NSC123139
61137-68-6

NSC123139

Conditions
ConditionsYield
With choline chloride; urea In trifluoroacetic acid at 25℃; for 2h;95%
(i) BF3-Et2O, AcOH, (ii) aq. NaOAc; Multistep reaction;
p-methoxytrityl alcohol
847-83-6

p-methoxytrityl alcohol

l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

NSC123528
177582-20-6

NSC123528

Conditions
ConditionsYield
With choline chloride; urea In trifluoroacetic acid at 25℃; for 2h;95%
(i) BF3-Et2O, AcOH, (ii) aq. NaOAc; Multistep reaction;
m-cyanophenol
873-62-1

m-cyanophenol

l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

(R)-2-(3'-hydroxyphenyl)-4,5-dihydrothiazole-4-carboxylic acid sodium salt

(R)-2-(3'-hydroxyphenyl)-4,5-dihydrothiazole-4-carboxylic acid sodium salt

Conditions
ConditionsYield
Stage #1: m-cyanophenol; l-cysteine hydrochloride With sodium hydrogencarbonate In ethanol for 1h; Heating;
Stage #2: With piperidine In ethanol for 48h; pH=9; Heating;		95%
l-cysteine hydrochloride
52-89-1

l-cysteine hydrochloride

2'-(2-hydroxyphenyl)-2'-thiazole-4'-carboxaldehyde
83053-39-8

2'-(2-hydroxyphenyl)-2'-thiazole-4'-carboxaldehyde

2'-(2-hydroxyphenyl)-2'',3'',4'',5''-tetrahydro[2'',4']bisthiazolyl-4''-carboxylic acid

2'-(2-hydroxyphenyl)-2'',3'',4'',5''-tetrahydro[2'',4']bisthiazolyl-4''-carboxylic acid

Conditions
ConditionsYield
With potassium acetate In ethanol; water at 20℃; for 1h;95%

L-Cysteine hydrochloride anhydrous Consensus Reports

Reported in EPA TSCA Inventory.

L-Cysteine hydrochloride anhydrous Specification

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.

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