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CAS 56-89-3

CAS 56-89-3 matches 0 EU annex records across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 56-89-3
CAS 56-89-3PubChem CID 67678

(-)-Cystine

L-cystine is the L-enantiomer of the sulfur-containing amino acid cystine. It has a role as an EC 1.2.1.11 (aspartate-semialdehyde dehydrogenase) inhibitor, a flour treatment agent, a mouse metabolite, a Saccharomyces cerevisiae metabolite and a human metabolite. It is a cystine, a non-proteinogenic L-alpha-amino acid and a L-cysteine derivative. It is a conjugate acid of a L-cystine anion. It is an enantiomer of a D-cystine. It is a tautomer of a L-cystine zwitterion. — ChEBI

IUPAC name
(2R)-2-amino-3-[[(2R)-2-amino-2-carboxyethyl]disulfanyl]propanoic acid
Molecular formula
C6H12N2O4S2
Molecular weight
240.3 g/mol
Exact mass
240.02384922 Da
XLogP3
-6.3
Topological polar surface area
177.0 Ų
Hydrogen-bond donors
4
Hydrogen-bond acceptors
8
Covalent units
1
Defined stereocentres
2

Also known as

L-cystinecystineL-Dicysteinebeta,beta'-DithiodialanineL-Cysteine disulfide1-CystineCystine, L-Dicysteine
16 more reported names
Cystine (L)-Cystine acidCysteine disulfideCystinAlanine, 3,3'-dithiodi-Alanine, 3,3'-dithiobis-beta,beta'-Dithioalanine, L-L-Alanine, 3,3'-dithiobis-L-alpha-Diamino-beta-dithiolactic acid3,3'-Dithiobis(2-aminopropanoic acid)3,3'-DithiodialaninecistinaBis(beta-amino-beta-carboxyethyl)disulfide(R-(R*,R*))-3,3'-Dithiobis(2-aminopropanoic acid)48TCX9A1VTbeta,beta'-Diamino-beta,beta'-dicarboxydiethyl disulfide
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External database identifiers

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Records for CAS 56-89-3

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How CAS 56-89-3 is used on this site

CAS 56-89-3 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 0 EU annex records share this identifier, which helps you cross-check whether the same substance appears under one regulatory context or several.

Use this page when a supplier specification, SDS or raw-material dossier gives you CAS 56-89-3 and you need to see every linked Annex II–VI record in one place. The entry cards above are the quickest route to concentration limits, warnings, annex placement and product-type conditions.