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Amino acids and derivatives

(-)-Cystine

Also known as L-cystine, cystine, L-Dicysteine

CAS 56-89-3Formula C6H12N2O4S2Molar mass 240.31 g/molEC 200-296-3
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(-)-Cystine chemical structure, C6H12N2O4S2, CAS 56-89-3
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
56-89-3
Formula
C6H12N2O4S2
Molar mass
240.31 g/mol
EC number
200-296-3
HS code
293090
Category
Amino acids and derivatives

What is (-)-Cystine?

Plain description, key identifiers and synonyms

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.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
(2R)-2-amino-3-[[(2R)-2-amino-2-carboxyethyl]disulfanyl]propanoic acid
CAS number
56-89-3 CAS number cross-checkedOther or deprecated CAS: 2079930-29-1, 24645-67-8, 923-32-0
EC number
200-296-3
Molecular formula
C6H12N2O4S2
UNII
48TCX9A1VT
MDL number
MFCD00064228
INCI name
CYSTINE
InChIKey
LEVWYRKDKASIDU-IMJSIDKUSA-N
InChI
InChI=1S/C6H12N2O4S2/c7-3(5(9)10)1-13-14-2-4(8)6(11)12/h3-4H,1-2,7-8H2,(H,9,10)(H,11,12)/t3-,4-/m0/s1
Canonical SMILES
NC(CSSCC(N)C(=O)O)C(=O)O
Isomeric SMILES
C([C@@H](C(=O)O)N)SSC[C@@H](C(=O)O)N

Synonyms

  • L-cystine
  • cystine
  • L-Dicysteine
  • beta,beta'-Dithiodialanine
  • L-Cysteine disulfide
  • 1-Cystine
  • Cystine, L-
  • Dicysteine
  • Cystine (L)-
  • Cystine acid
  • Cysteine disulfide
  • Cystin
  • Alanine, 3,3'-dithiodi-
  • Alanine, 3,3'-dithiobis-
  • beta,beta'-Dithioalanine, L-
  • L-Alanine, 3,3'-dithiobis-
  • L-alpha-Diamino-beta-dithiolactic acid
  • 3,3'-Dithiobis(2-aminopropanoic acid)
  • 3,3'-Dithiodialanine
  • cistina
  • Bis(beta-amino-beta-carboxyethyl)disulfide
  • (R-(R*,R*))-3,3'-Dithiobis(2-aminopropanoic acid)
  • beta,beta'-Diamino-beta,beta'-dicarboxydiethyl disulfide
  • (2R,2'R)-3,3'-disulfanediylbis(2-aminopropanoic acid)
  • beta,beta'-Diamino-beta,beta'-dicarboxydiethyldisulfide
Show all 38 synonyms
  • 3,3'-Dithiobis(2-aminopropanoic acid), (R-(R*,R*))-
  • Propanoic acid, 3,3'-dithiobis(2-amino-, (R-(R*,R*))-
  • (2R)-2-amino-3-{[(2R)-2-amino-2-carboxyethyl]disulfanyl}propanoic acid
  • (R,R)-3,3'-dithiobis(2-aminopropanoic acid)
  • (2R)-2-amino-3-[[(2R)-2-amino-2-carboxyethyl]disulfanyl]propanoic acid
  • alpha-Diamino-beta-dithiolactic acid
  • L Cystine
  • cystinum
  • (2R)-2-amino-3-(((2R)-2-amino-2-carboxyethyl)disulfanyl)propanoic acid
  • 3,3'-Disulfanediylbis((2R)-2-aminopropanoic acid)
  • (2R)-2-azaniumyl-3-(((2R)-2-azaniumyl-2-carboxylatoethyl)disulfanyl)propanoate
  • 2-amino-3-((2-amino-2-carboxyethyl)disulfanyl)propanoic acid
  • 3,3'-disulfanediylbis(2-aminopropanoic acid)

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
240.31 g/molcalc.
Exact mass
240.0238 Dacalc.
LogP (octanol/water)
-0.81calc.
Topological polar surface area
126.6 Ųcalc.
Hydrogen bond donors
4calc.
Hydrogen bond acceptors
6calc.
Rotatable bonds
7calc.
Heavy atoms
14calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0.67calc.
Formal charge
0calc.
Stereocentres
2calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

(-)-Cystine suppliers

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Where suppliers are based

160 suppliers in 23 countries

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(-)-Cystine price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Use classes: Cosmetics.

Cosmetic ingredient, INCI name CYSTINE(antistatic, hair conditioning, fragrance)

Roles

  • Saccharomyces cerevisiae metabolite
  • additive
  • animal metabolite
  • enzyme inhibitor
  • eukaryotic metabolite
  • flour treatment agent
  • food additive
  • food component
  • fungal metabolite
  • human metabolite
  • mammalian metabolite
  • metabolite
  • mouse metabolite
  • physiological role

Functional uses

  • Anti-static agent
  • Deodorizer
  • Filler
  • Flavouring and nutrient
  • Softener and conditioner

Cosmetic functions

  • Antistatic
  • Fragrance
  • Hair conditioning

Pharmacology

Cystine is not considered one of the 20 amino acids, Cystine is a sulfur-containing derivative obtained from oxidation of cysteine amino acid thiol side chains. It functions as an antioxidant and protects tissues against radiation and pollution, slowing the aging process. It also aids protein synthesis. Cystine is abundant in many proteins of skeletal tissues and skin, and found in insulin and digestive enzymes chromotrypsinogen A, papain, and trypsinogen. (NCI04)

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code (-)-Cystine is traded under.

HS 2930.90Indicative HS code

Organo-sulphur compounds, other

World exports in 2024
$5.83B
+0.1% vs 2023, imports $5.93B
2019 to 2024
Top exporters
  1. China40.7%
  2. United States10.9%
  3. Japan9.3%
Top importers
  1. United States13.3%
  2. Brazil12.6%
  3. China6.6%
Reported customs values in USD, not prices.Full trade data

The HS code shown for (-)-Cystine is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about (-)-Cystine, based on the data on this page

What is (-)-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.

What is the CAS number of (-)-Cystine?

The CAS registry number of (-)-Cystine is 56-89-3. Other or deprecated CAS numbers: 2079930-29-1, 24645-67-8, 923-32-0.

What is the molecular formula and weight of (-)-Cystine?

The molecular formula of (-)-Cystine is C6H12N2O4S2 and its molar mass is 240.31 g/mol.

What is (-)-Cystine used for?

Use classes: Cosmetics.

Is (-)-Cystine hazardous?

No GHS hazard classification for (-)-Cystine is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of (-)-Cystine?

(-)-Cystine is usually classified under HS code 293090 (Organo-sulphur compounds, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy (-)-Cystine?

CompoundList lists 160 suppliers of (-)-Cystine in China, United States, India, Germany and 19 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy (-)-Cystine in India?

12 suppliers in India list (-)-Cystine on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of (-)-Cystine?

Suppliers quote (-)-Cystine on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle (-)-Cystine

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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