Caffeine
A trimethylxanthine in which the three methyl groups are located at positions 1, 3, and 7. A purine alkaloid that occurs naturally in tea and coffee. — ChEBI
Safety documents & references
1 indexed referencesFind a product-specific SDS
Safety guides and government classification records are not a manufacturer’s SDS. Match supplier, product number, concentration, physical form, region and revision before using a document.
Identity & molecular properties
Source-linked values| CAS number | 58-08-2 | ChEBI ↗ |
| Molecular formula | C8H10N4O2 | ChEBI ↗ |
| Molar mass | 194.194 g/mol | ChEBI ↗ |
| Monoisotopic mass | 194.08038 Da | ChEBI ↗ |
| Formal charge | 0 | ChEBI ↗ |
| ChEBI identifier | CHEBI:27732 | ChEBI ↗ |
Cross-source molecular data
PubChem| Molar mass | 194.19 g/mol | PubChem ↗ |
| Exact mass | 194.08037557 Da | PubChem ↗ |
| Computed XLogP | -0.1 | PubChem ↗ |
| Topological polar surface area (Ų) | 58.4 | PubChem ↗ |
| H-bond donors | 0 | PubChem ↗ |
| H-bond acceptors | 3 | PubChem ↗ |
| Rotatable bonds | 0 | PubChem ↗ |
PubChem computed values are shown separately from the ChEBI record. An exact InChIKey match was used to connect the records. Molecular descriptors do not describe a supplied product’s purity, particle size or performance.
Names & structural identifiers
Copy any identifiercaffeine1,3,7-trimethyl-3,7-dihydro-1H-purine-2,6-dioneRYYVLZVUVIJVGH-UHFFFAOYSA-NCn1c(=O)c2c(ncn2C)n(C)c1=OInChI=1S/C8H10N4O2/c1-10-4-9-6-5(10)7(13)12(3)8(14)11(6)2/h4H,1-3H3Names & synonyms
Names are supplied by ChEBI. Trade names and related synonyms may describe a broader product context.
Classification & relationships
ChEBI ontologyRoles recorded in ChEBI
Database role annotations describe reported biological or chemical roles; they are not product approvals or recommendations for use.
Safety classification · Japan
NITE / Japanese governmentcaffeine · 20A2140
| Endpoint | Reported classification |
|---|---|
| Acute toxicity （Oral） | Category 3 |
| Acute toxicity （Inhalation: Dusts and mists） | Category 4 |
| Reproductive toxicity | Category 1A |
| Hazardous to the aquatic environment （Acute） | Category 3 |
| Hazardous to the aquatic environment （Long-term） | Category 3 |
Selected source-reported endpoints. Other endpoints, rationales and conditions remain in the original classification. Missing or unlisted information does not mean non-hazardous. This is not a global classification or transport decision.
Read the original NITE classificationMass ↔ amount of substance
Calculated from sourced massUses 194.194 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.
Elemental composition
Theoretical mass fractionsCNOHCalculated theoretical mass fractions from the reported formula and PubChem periodic-table atomic masses. These are not assay or purity results.
Research & patent references
Selected source associationsSources & record history
Checked 27 Sep 2026Release 255, 9 September 2026. ChEBI three-star (manually annotated) source entry. View original record ↗ · CC BY 4.0
PubCAS formats source data, connects references and computes explicitly labelled conversions. CAS cross-references are supplied by ChEBI; they do not constitute CAS verification or endorsement.