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API Process Intermediates & Related Compounds

S-Methyl-L-cysteine

Available on request

Order S-Methyl-L-cysteine (CAS 1187-84-4) online at Zemixal: C4H9NO2S, COA and SDS with every lot, worldwide shipping. Catalogue no. ZX-033661.

Pack sizes
S-Methyl-L-cysteine chemical structure
CAS number1187-84-4
FormulaC4H9NO2S
Molar mass135.19 g/mol
Physical formSolid
InChIKeyIDIDJDIHTAOVLG-VKHMYHEASA-N
IUPAC name(2R)-2-amino-3-methylsulfanylpropanoic acid

About S-Methyl-L-cysteine

Researchers and plant chemists source S-Methyl-L-cysteine from Zemixal for routine and specialised work. Key data: CAS 1187-84-4, formula C4H9NO2S and molar mass 135.19 g/mol. It is handled as a solid.

Common uses in the lab and plant

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

Safe handling

Hazard communication follows GHS (Warning: H302, H315, H319 and H335). Our SDS lists exposure controls and first-aid measures.

Available as 10 mg, 25 mg, 50 mg and 100 mg. Larger or split packs can be arranged. You receive a batch certificate of analysis and a 16-section SDS with each order. Add it to your quote list and our team replies with price, lead time and shipping options within one business day.

Reference standards for Cysteine

See every impurity, metabolite and related compound we list for this API.

Cysteine standards

Typical uses

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

Applications

Pharmaceutical Manufacturing and QCResearch Labs and Universities

Specifications and identifiers

Specifications of S-Methyl-L-cysteine
Product nameS-Methyl-L-cysteine
Catalogue numberZX-033661
CAS number1187-84-4
IUPAC name(2R)-2-amino-3-methylsulfanylpropanoic acid
Molecular formulaC4H9NO2S
Molar mass135.19 g/mol
Exact mass135.0354
Physical formSolid
XLogP3-2.7
H-bond donors / acceptors2 / 4
Topological polar surface area88.6 Ų
InChIKeyIDIDJDIHTAOVLG-VKHMYHEASA-N
SMILESCSC[C@@H](C(=O)O)N
PubChem CID24417
SynonymsS-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

Lot values are stated on the batch certificate of analysis. Ask for a typical COA with your quotation.

Safety and GHS hazards

GHS07 Irritant or harmful
Irritant or harmful

Signal word Warning

  • 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 summarised from public GHS notifications. It can vary with grade and concentration, so always follow the SDS supplied with your lot.

Pack sizes

Pack sizes of S-Methyl-L-cysteine
10 mgQuoted on request
25 mgQuoted on request
50 mgQuoted on request
100 mgQuoted on request

Need a different size? Bulk drums and custom packing are quoted on request through the quote form on this page.

Questions about S-Methyl-L-cysteine

Which CAS number identifies S-Methyl-L-cysteine?
S-Methyl-L-cysteine is registered under CAS 1187-84-4. You may also see it listed as S-Methylcysteine, L-Cysteine, S-methyl-, (2R)-2-amino-3-(methylsulfanyl)propanoic acid. Our catalogue number for this item is ZX-033661.
What are the formula and molar mass of S-Methyl-L-cysteine?
For S-Methyl-L-cysteine, its formula is C4H9NO2S and its molar mass is 135.19 g/mol. The systematic (IUPAC) name is (2R)-2-amino-3-methylsulfanylpropanoic acid. InChIKey IDIDJDIHTAOVLG-VKHMYHEASA-N lets you match it in any structure database.
How is S-Methyl-L-cysteine used in pharmaceutical QC?
S-Methyl-L-cysteine is a characterised reference material linked to Cysteine. Laboratories use it to identify and quantify this impurity during method development and validation, stability work, batch release testing and regulatory submissions.
What grade and pack sizes are available for S-Methyl-L-cysteine?
The grade and assay are confirmed on the quotation and the batch COA. Standard packs are 10 mg, 25 mg, 50 mg, 100 mg. Larger quantities and custom packing can be quoted on request.
Which documents come with S-Methyl-L-cysteine?
Each lot ships with a batch certificate of analysis and a 16-section GHS safety data sheet. A typical COA or specification sheet can be shared with the quotation before you order.
Can Zemixal ship S-Methyl-L-cysteine to my country?
Yes. Because S-Methyl-L-cysteine is classed as hazardous, it travels in UN-approved packaging as dangerous goods under IATA or IMDG rules, with the export paperwork your broker needs.

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