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Amino acids and derivatives

D-Cysteine

Also known as (2S)-2-amino-3-sulfanylpropanoic acid, Cysteine, D-, (S)-2-amino-3-mercaptopropanoic acid

CAS 921-01-7Formula C3H7NO2SMolar mass 121.16 g/molEC 213-062-0
GHS signal word: Warning. Pictograms: Harmful or irritant 11 suppliers listed
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D-Cysteine chemical structure, C3H7NO2S, CAS 921-01-7
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
921-01-7
Formula
C3H7NO2S
Molar mass
121.16 g/mol
EC number
213-062-0
HS code
293090
Category
Amino acids and derivatives

What is D-Cysteine?

Plain description, key identifiers and synonyms

D-cysteine is an optically active form of cysteine having D-configuration. It is a cysteine and a D-alpha-amino acid. It is a conjugate base of a D-cysteinium. It is a conjugate acid of a D-cysteinate(1-). It is an enantiomer of a L-cysteine. It is a tautomer of a D-cysteine zwitterion.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
(2S)-2-amino-3-sulfanylpropanoic acid
CAS number
921-01-7 CAS number cross-checked
EC number
213-062-0
Molecular formula
C3H7NO2S
UNII
IU8WN3PPI2
MDL number
MFCD00066461
InChIKey
XUJNEKJLAYXESH-UWTATZPHSA-N
InChI
InChI=1S/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)/t2-/m1/s1
Canonical SMILES
NC(CS)C(=O)O
Isomeric SMILES
C([C@H](C(=O)O)N)S

Synonyms

  • (2S)-2-amino-3-sulfanylpropanoic acid
  • Cysteine, D-
  • (S)-2-amino-3-mercaptopropanoic acid
  • D-Cystein
  • (S)-Cysteine
  • D-Zystein
  • D-Amino-3-mercaptopropionic acid
  • (2S)-2-amino-3-mercaptopropanoic acid
  • Cysteine. (S)-
  • (2S)-2-azaniumyl-3-sulfanylpropanoate
  • (S)-2-Amino-3-mercaptopropionic acid
  • D-Cys
  • (S)-2-amino-3-mercaptopropanoicacid
  • DCY
  • 4A30FFBA-E85B-4310-BCD5-5414B37D35D0
  • H-D-CYS-OH
  • Cystei
  • D-Amino-3-mercaptopropionate
  • D-Cysteine, >=99% (RT)

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
121.16 g/molcalc.
Exact mass
121.0197 Dacalc.
LogP (octanol/water)
-0.67calc.
Topological polar surface area
63.32 Ųcalc.
Hydrogen bond donors
3calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
2calc.
Heavy atoms
7calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0.67calc.
Formal charge
0calc.
Stereocentres
1calc.
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

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H302Harmful if swallowed.
Precautionary statements (5)
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P301 + P317If swallowed: Get medical help.
  • P330Rinse mouth.
  • P501Dispose of contents and container in accordance with local regulations.

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

Full safety data and first aid

D-Cysteine suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 11 suppliers
11 of 11 offers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

11 suppliers in 5 countries

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D-Cysteine price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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Uses and applications

What the substance is used for, by industry and function

Roles

  • fundamental metabolite
  • metabolite

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code D-Cysteine 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 D-Cysteine is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about D-Cysteine, based on the data on this page

What is D-Cysteine?

D-cysteine is an optically active form of cysteine having D-configuration. It is a cysteine and a D-alpha-amino acid. It is a conjugate base of a D-cysteinium. It is a conjugate acid of a D-cysteinate(1-). It is an enantiomer of a L-cysteine. It is a tautomer of a D-cysteine zwitterion.

What is the CAS number of D-Cysteine?

The CAS registry number of D-Cysteine is 921-01-7.

What is the molecular formula and weight of D-Cysteine?

The molecular formula of D-Cysteine is C3H7NO2S and its molar mass is 121.16 g/mol.

What is D-Cysteine used for?

Known uses and roles of D-Cysteine include fundamental metabolite and metabolite.

Is D-Cysteine hazardous?

D-Cysteine carries the GHS signal word "Warning". Main hazards: harmful if swallowed. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of D-Cysteine?

D-Cysteine 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 D-Cysteine?

CompoundList lists 11 suppliers of D-Cysteine in United States, China, India, Italy and 1 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy D-Cysteine in India?

1 supplier in India list D-Cysteine on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of D-Cysteine?

Suppliers quote D-Cysteine 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 D-Cysteine

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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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