S-Methyl-L-cysteine

Name: S-Methyl-L-cysteine
Brand: Vaqora Chemicals
SKU: VQ-037833

About S-Methyl-L-cysteine

Listed under CAS 1187-84-4, S-Methyl-L-cysteine is a process intermediate or related compound of Cysteine available from Vaqora Chemicals. Its molecular formula is C4H9NO2S and its molecular weight is 135.19 g/mol. The IUPAC name is (2R)-2-amino-3-methylsulfanylpropanoic acid. It is also known as S-Methylcysteine or L-Cysteine, S-methyl-.

The product is provided as a solid. Reference materials should be stored sealed and away from light and moisture, as specified on the accompanying COA. The GHS classification uses the signal word “Warning”, so appropriate gloves, eye protection and ventilation are recommended.

Process chemists and analysts use it when developing synthetic routes to Cysteine, tracking process-related impurities and validating analytical methods. Typical end-use sectors are pharmaceutical manufacturing and academic and industrial research.

We offer S-Methyl-L-cysteine in 10 mg, 25 mg, 50 mg and 100 mg packs with a batch-specific COA, and ship to customers worldwide.

Typical applications

API route development
Impurity fate & purge studies
Analytical method development
Fine chemical synthesis

Industries

Related to Cysteine

View every impurity, metabolite and intermediate we list for Cysteine.

Cysteine impurities

Specifications & identifiers

Chemical identifiers
Product name	S-Methyl-L-cysteine
Catalogue No.	VQ-037833
CAS Number	1187-84-4
IUPAC name	(2R)-2-amino-3-methylsulfanylpropanoic acid
Molecular formula	C₄H₉NO₂S
Molecular weight	135.19 g/mol
Exact mass	135.0354
InChIKey	IDIDJDIHTAOVLG-VKHMYHEASA-N
SMILES	CSC[C@@H](C(=O)O)N
PubChem CID	24417

Physical properties
Physical form	Solid
LogP (XLogP3)	-2.7
H-bond donors / acceptors	2 / 4
TPSA	88.6 Å²
Synonyms	S-Methylcysteine, L-Cysteine, S-methyl-, (2R)-2-amino-3-(methylsulfanyl)propanoic acid, (2R)-2-azaniumyl-3-methylsulfanylpropanoate, H-Cys(Me)-OH, S-methyl-cysteine, (R)-2-amino-3-(methylthio)propanoic acid, Methylcysteine, 3-(methylthio)-L-alanine, H-Cys(Me)-OH.HCl, L-Methylcysteine

Safety & hazard information (GHS)

Harmful / irritant

Signal word: Warning

Hazard statements

H302Harmful if swallowed
H315Causes skin irritation
H319Causes serious eye irritation
H335May cause respiratory irritation

Precautionary statements: P261, P264, P264 + P265, P270, P271, P280, P301 + P317, P302 + P352, P304 + P340, P305 + P351 + P338, P319, P321, P330, P332 + P317, P337 + P317, P362 + P364, P403 + P233, P405, P501

Classification is indicative (aggregated GHS notifications) and may vary by grade and concentration. Always refer to the SDS supplied with your lot.

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Frequently asked questions

What is the CAS number of S-Methyl-L-cysteine?

The CAS Registry Number of S-Methyl-L-cysteine is 1187-84-4. It is also known as S-Methylcysteine, L-Cysteine, S-methyl-, (2R)-2-amino-3-(methylsulfanyl)propanoic acid.

What is the molecular formula and molecular weight of S-Methyl-L-cysteine?

S-Methyl-L-cysteine has the molecular formula C4H9NO2S and a molecular weight of 135.19 g/mol. Its IUPAC name is (2R)-2-amino-3-methylsulfanylpropanoic acid.

What is S-Methyl-L-cysteine used for?

S-Methyl-L-cysteine is supplied as a characterised reference material related to Cysteine. It is used for analytical method development and validation (AMV), impurity profiling, stability studies and quality control, and in ANDA/DMF regulatory filings.

Which grade and pack sizes of S-Methyl-L-cysteine can I order?

We supply S-Methyl-L-cysteine, in 10 mg, 25 mg, 50 mg, 100 mg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with S-Methyl-L-cysteine?

Yes. Every lot of S-Methyl-L-cysteine is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can S-Methyl-L-cysteine be shipped internationally?

Yes. S-Methyl-L-cysteine is classified as hazardous, so it is packed in UN-approved packaging and shipped as dangerous goods under IATA/IMDG rules. We export worldwide on EXW, FOB, CIF and DAP terms.