(4R)-(−)-2-Thioxo-4-thiazolidinecarboxylic acid
(4R)-(−)-2-Thioxo-4-thiazolidinecarboxylic acid (CAS: 98169-56-3), with the molecular formula C4H5NO2S2 and a molecular weight of 163.22 g/mol, is a valuable chiral building block. Its specific optical rotation, [α]29/D −86°, highlights its stereochemical integrity. This compound serves as a key intermediate in chemical synthesis, particularly within the fields of chemical biology, peptide chemistry, and the development of unnatural amino acid derivatives.
- IUPAC
- (R)-(−)-2-Thioxo-4-thiazolidinecarboxylic acid,Raphanusamic acid
- Synonyms
- Raphanusamic acid

Chiral Building Block in Organic Synthesis
This compound's defined stereochemistry makes it a crucial intermediate for constructing complex chiral molecules. It is employed in syntheses where precise stereochemical control is essential.
Peptide Chemistry and Unnatural Amino Acids
Its structure lends itself to the incorporation of modified amino acid residues into peptides. This is vital for creating novel peptidomimetics and probing biological functions.
Chemical Biology Research
The unique thiazolidine ring system and chirality allow for its use in developing molecular probes or modifying biomolecules. This aids in studying biological pathways and protein interactions.
| Molecular weight | 163.22 |
|---|---|
| Empirical formula | C4H5NO2S2 |
| Assay | 99% |
| Optical activity | [α]29/D −86°, c = 2.5 in 0.5 M HCl |
| Melting point | 179-181 °C(lit.) |

Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26-36 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is (4R)-(−)-2-Thioxo-4-thiazolidinecarboxylic acid used for?
+
(4R)-(−)-2-Thioxo-4-thiazolidinecarboxylic acid is used as a chiral building block in organic synthesis, particularly for applications in chemical biology, peptide chemistry, and the synthesis of unnatural amino acid derivatives.
What are the CAS number and formula for (4R)-(−)-2-Thioxo-4-thiazolidinecarboxylic acid?
+
The CAS number for (4R)-(−)-2-Thioxo-4-thiazolidinecarboxylic acid is 98169-56-3, and its empirical formula is C4H5NO2S2.
What grade and purity does Tech Serve Solutions supply?
+
Tech Serve Solutions supplies this chemical with an assay of 99%. This product is intended for research and laboratory use and is not represented as USP, BP, EP, or pharmacopoeia grade.
How should (4R)-(−)-2-Thioxo-4-thiazolidinecarboxylic acid be handled?
+
This compound is a Warning substance, causing skin irritation (H315), serious eye irritation (H319), and respiratory irritation (H335). Appropriate personal protective equipment, including a dust mask type N95 (US), eyeshields, and gloves, should be used. Work in a well-ventilated area or fume hood.
How is (4R)-(−)-2-Thioxo-4-thiazolidinecarboxylic acid packed and shipped?
+
This chemical is typically packed in appropriate containers for safe transport and is exported globally by Tech Serve Solutions, adhering to all relevant shipping regulations.
How can I request a sample or quote?
+
To request a sample or a quotation for (4R)-(−)-2-Thioxo-4-thiazolidinecarboxylic acid, please contact our sales department through the website or by phone.
▶ Related products

1-(2-Fluorobenzyl)piperazine
C11H15FN2
Chemical Synthesis
1-(2-Fluorophenyl)biguanide hydrochloride
Chemical Synthesis

1-(2-Fluorophenyl)cyclopropanecarboxylic acid
C10H9FO2
Chemical Synthesis
1-(2-Fluorophenyl)piperazine
C10H13FN2
Chemical Synthesis
1-(2-Fluorophenyl)piperazine monohydrochloride
C10H13FN2 · HCl
Chemical Synthesis
1-(2-Furoyl)-1H-benzotriazole
C11H7N3O2
Chemical Synthesis
1-(2-Furoyl)piperazine
C9H12N2O2
Chemical Synthesis
1-(2-Hydroxy-5-methylphenyl)-3-phenyl-1,3-propanedione
Chemical Synthesis
▶ Explore more

3-Methyl-1,5-di-p-tolyl-1,4-pentazadiene
Chemical Synthesis

3-Methyl-1,5-pentanediol
Chemical Synthesis

3-Methyl-1-(2-methylphenyl)-1H-pyrazol-5-amine
C11H13N3
Chemical Synthesis
3-Methyl-1-(3′-sulfoamidophenyl)-5-pyrazolone
C10H11N3O3S
Chemical Synthesis