C3H7NO2S
121.16 g/mol
Food AdditiveWarning
L-cysteine
CAS52-90-4EC200-158-2
Category
Food Additive
Compound Class
Natural Product
Primary Use
Flavor and nutrition additive
L-cysteine is a naturally occurring amino acid that acts as a flavor and nutrition additive in foods. It is commonly used to improve dough handling properties in bread production and serves as a reducing agent in various biochemical research applications.
flavor and nutrition additivereducing agent in bread doughsbiochemical and nutrition research
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Related Compounds
StrongSame Parent
Cysteine hydrochloride monohydrate
CAS7048-04-6
flavor enhancer and nutritional supplement
StrongSame Parent
Cysteine hydrochloride
CAS52-89-1
dough conditioner and nutritional supplement
ReferenceSame Category
Hesperidin
CAS520-26-3
flavonoid dietary supplement and antioxidant
ReferenceSame Category
Dehydroacetic acid
CAS520-45-6
fungicide and preservative
ReferenceSame Category
Diarginine oxoglurate
CAS5256-76-8
dietary supplement ingredient
ReferenceSame Category
Tartaric acid
CAS526-83-0
acidulant and flavoring agent
Referencestereoisomer of
D-cysteine zwitterion
CAS921-01-7
research compound
Referencestereoisomer of
DL-Cysteine hydrochloride monohydrate
CAS96998-61-7
research compound
Safety Reference
Warning
H302Harmful if swallowed
H315Causes skin irritation
H319Causes serious eye irritation
H335May cause respiratory irritation
Customs Tariff Classification
The international HS code for L-cysteine (CAS 52-90-4) is 2930.90.
HS code (international, 6-digit)
2930.90
EU CN code (8-digit)
2930 90 13
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
(2R)-2-amino-3-sulfanylpropanoic acid
InChIKey
XUJNEKJLAYXESH-REOHCLBHSA-N
SMILES
C([C@@H](C(=O)O)N)S
Synonyms (80)
- E920
- E921
- Acetylcysteine EP Impurity B; Cysteine; Glutathione EP Impurity B
- Cisteina [INN-Spanish]
- Cysteinum [INN-Latin]
- L-Cysteine; Acetylcysteine Imp. B (EP); Acetylcysteine Impurity B
- (R)-Cysteine
- 1ssq
- 1xt8
- 2-Amino-3-mercaptopropionate
- 2-amino-3-mercapto-, (R)-
- 2-amino-3-mercaptopropanoate
- 3-mercapto-L-Alanine
- ACETYLCYSTEINE IMPURITY B
- CYSTEINE [MART.]
- Cisteina [Spanish]
- Cisteinum
- Cisteinum [Latin]
- Cys
- Cystein
- Cysteine, L-
- Cysteinum
- Ecolan (TN)
- FREE CYSTEINE
- H-Cys-OH
- H-Cys-OH HCl H
- H-Cys-OH from animal source
- Half-cystine
- L-Alanine, 3-mercapto-
- L-Cys
- L-Cystein
- L-Cysteine (JP18)
- L-Cysteine 7403
- L-Cysteine High
- L-Cysteine High 7404
- L-Cysteine, SAJ special grade
- L-Zystein
- L-cysteine
- S-Alkyl-L-cysteine
- S-alkyl-L-cysteines
- Thioserine
- b-Mercaptoalanine
- beta-Mercaptoalanine
- beta-Mercaptoalanine, L-
- cisteina
- cysteine
- l-cycteine
- l-cystAine
- l-cysteinum
- racemic cysteine
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