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(1)Name:L-Cysteine

Synonyms:(+)-2-Amino-3-mercaptopropionic acid; L-beta-Mercaptoalanine; CySH

Molecular Structure:

Molecular Formula:C₃H₇NO₂S

Molecular Weight:121.15

CAS Registry Number:52-90-4

EINECS:200-158-2

FEMA:3263

Cysteine (abbreviated as Cys or C) is an α-amino acid with the chemical formula HO2CCH(NH2)CH2SH. It is a non-essential amino acid, which means that humans can synthesize it. Its codons are UGU and UGC. With a thiol side chain, cysteine is classified as a hydrophobic amino acid. Because of the high reactivity of this thiol, cysteine is an important structural and functional component of many proteins and enzymes. Cysteine is named after cystine, its oxidized dimer. Specification:

Product name	L-Cysteine
Items	Specifications
Appearance	White crystal or crystalline powder
Identification	Meets the requirements
Optical rotation	+8.3 ~ +9.5°
Heavy metals	10 ppm Max.
Moisture	0.50 % Max.
Residue on ignition	0.10 % Max.
Assay	98.0 ~ 101.0 %
pH	4.5 ~ 5.5

Keywords Glutathione ac n acetyl l cysteinel glutathioneacetyl l cysteineimmunical educed glutathioneimmunocalcysteinel cysteinecysteine hydrochloride acetyl l cysteine acetylcysteine ac powder acetylacetyl cysteine acetyl cysteine acetyl cysteine supplement ac n acetyl cysteine

(2)Name:DL-Cysteine

Synonyms:2-Amino-3-mercaptopropionic acid

Molecular Structure:

Molecular Weight:121.16

CAS Registry Number:3374-22-9

EINECS:222-160-2