Official EU label nameGlossary entry 28810

THYMINE

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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Evidence gaps

Resolved identifiers

Resolved substance identity

CAS:65-71-4

EC:200-616-1

Ingredient index records:

THYMINE

Cosmetic functions: SKIN CONDITIONING

2,4-(1H,3H)-Pyrimidinedione, 5-methyl-

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1 matched or reported name

THYMINE

Regulatory evidence across markets

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

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 65-71-4

CAS 65-71-4PubChem CID 1135

Thymine

Thymine is a pyrimidine nucleobase that is uracil in which the hydrogen at position 5 is replaced by a methyl group. It has a role as a mouse metabolite, an Escherichia coli metabolite and a human metabolite. It is a pyrimidine nucleobase and a pyrimidone. — ChEBI

IUPAC name: 5-methyl-1H-pyrimidine-2,4-dione

Molecular formula: C5H6N2O2
Molecular weight: 126.11 g/mol
Exact mass: 126.042927438 Da
XLogP3: -0.6
Topological polar surface area: 58.2 Å²
Hydrogen-bond donors: 2
Hydrogen-bond acceptors: 2
Covalent units: 1
Defined stereocentres: 0

Also known as

5-methyluracil2,4-Dihydroxy-5-methylpyrimidineThyminThymine anhydrate5-Methyl-1,2,3,4-tetrahydropyrimidine-2,4-dione2,4(1H,3H)-Pyrimidinedione, 5-methyl-Thymin (purine base)5-methyl-2,4(1H,3H)-pyrimidinedione

16 more reported names

QR26YLT7LTCHEBI:17821NSC-14705NSC-1686635 MethyluracilRefChem:6308200-616-15-methylpyrimidine-2,4(1H,3H)-dione5-Methyl UracilCCRIS 5584AI3-25479CHEMBL993THYMINE-13C1thymine-d42792-47-43059-73-2

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External database identifiers

ChEBI:CHEBI:17821
ChEMBL:CHEMBL993
EPA DTXSID:DTXSID4052342
PubMed:23124466
PubMed:23113232
PubMed:23110220
PubMed:23101657
PubMed:23090661
PubMed:23074908
PubMed:23062056
PubMed:23034556
PubMed:23032709
PubMed:22994134
PubMed:22990774
PubMed:22983594

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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