Official EU label nameGlossary entry 18541

OXOTHIAZOLIDINECARBOXYLIC ACID

This record confirms an official common ingredient name for EU cosmetic product labelling. It does not by itself confirm that the substance is permitted, unrestricted or safe.

Global evidence snapshot

The resolved identity has matching regulatory evidence in 0 of 13 indexed market datasets: 0 country records and 0 EU Annex records. Every result and evidence gap is listed below.

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Resolved identifiers

Resolved substance identity

CAS:19771-63-2

Ingredient index records:

OXOTHIAZOLIDINECARBOXYLIC ACID

Cosmetic functions: SKIN CONDITIONING

L-2-Oxothiazolidine-4-carboxylic acid

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1 matched or reported name

OXOTHIAZOLIDINECARBOXYLIC ACID

Regulatory evidence across markets

None of the 13 markets tracked here holds an imported rule under the name OXOTHIAZOLIDINECARBOXYLIC ACID.

That is a statement about this inventory, not about the law: no imported rule is not evidence that a substance is permitted. A rule may exist under a different name, under a CAS or EC number this glossary entry does not carry, or in a dataset not yet imported.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 19771-63-2

CAS 19771-63-2PubChem CID 72390

Procysteine

(4R)-2-oxo-4-thiazolidinecarboxylic acid is an organonitrogen compound and an organooxygen compound. It is functionally related to an alpha-amino acid. — ChEBI

IUPAC name: (4R)-2-oxo-1,3-thiazolidine-4-carboxylic acid

Molecular formula: C4H5NO3S
Molecular weight: 147.15 g/mol
Exact mass: 146.99901420 Da
XLogP3: -0.1
Topological polar surface area: 91.7 Å²
Hydrogen-bond donors: 2
Hydrogen-bond acceptors: 4
Covalent units: 1
Defined stereocentres: 1

Also known as

(R)-2-Oxothiazolidine-4-carboxylic acidoxothiazolidinecarboxylic acidKoprosteineL-2-Oxothiazolidine-4-carboxylic acid4-Thiazolidinecarboxylic acid, 2-oxo-, (4R)-L-2-Oxo-4-thiazolidinecarboxylic acid4-Thiazolidinecarboxylic acid, 2-oxo-, L-(-)-2-Oxo-4-thiazolidinecarboxylic acid

16 more reported names

X7063P804E2-oxo-l-thiazolidine-4-carboxylic acid2-OXO-4-THIAZOLIDINECARBOXYLIC ACID, L-2-oxo-4-thiazolidine carboxylic acidRefChem:930008L-2-OTZD-4-CXA2-Oxothiazolidine-4-carboxylic acid4-Thiazolidinecarboxylic acid, 2-oxo-(R)-(-)-2-Oxothiazolidine-4-carboxylic acid(4R)-2-oxothiazolidine-4-carboxylic acid(R)-2-Oxo-4-thiazolidinecarboxylic acidL-2-Oxothiazolidine-4-carboxylateL-2-Thiazolidinone-4-carboxylic Acid4-Thiazolidinecarboxylic acid, 2-oxo-, (R)-C4H5NO3SHMS2051K09

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External database identifiers

ChEBI:CHEBI:125673
ChEMBL:CHEMBL442218
EPA DTXSID:DTXSID501318247
PubMed:10579837
PubMed:9144376
PubMed:7834394
PubMed:7811547

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Additional authoritative substance research

Each link searches that source for this identity. A link is a research route, not a claim that the source holds an exact record. What each source is, and its legal weight

Cosmetic Ingredient Review safety assessments FDA Global Substance Registration System ILO/WHO International Chemical Safety Cards Japan NITE-CHRIP NIOSH Pocket Guide to Chemical Hazards OECD eChemPortal US EPA CompTox CTX APIs

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Official source and scope

Imported from Commission Implementing Decision (EU) 2025/1175 (dataset version EU 2025/1175). The glossary supplies common ingredient names for the ingredient list required by Article 19(1)(g); it is not an approval or safety list.

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