CAS Registry Numbers

E205108

chemical identifier registry number

CAS Registry Numbers are unique numerical identifiers assigned to chemical substances, widely used to unambiguously reference specific chemicals in scientific, regulatory, and industrial contexts.

Try in SPARQL Jump to: Surface forms Disambiguation Statements Elicitation Referenced by

All labels observed (3)

Label	Occurrences
CAS Registry Numbers canonical	3
CAS Registry database	1
Chemical Abstracts Service Registry Number	1

How this entity was disambiguated

This entity first appeared as the object of triple T1808945 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: CAS Registry Numbers
Context triple: [Chemical Abstracts Service, knownFor, CAS Registry Numbers]

A. Chemical Abstracts Service
Chemical Abstracts Service is a division of the American Chemical Society that provides a comprehensive database of chemical literature and substances, widely used for research and indexing in the chemical sciences.
B. TSCA Inventory of chemical substances
The TSCA Inventory of chemical substances is the official U.S. Environmental Protection Agency list of chemical substances that are manufactured, processed, or imported in the United States for commercial purposes.
C. SciFinder-n
SciFinder-n is a comprehensive research discovery platform from Chemical Abstracts Service that enables scientists to search and analyze chemical substances, reactions, literature, and related scientific data.
D. Index Chemicus
Index Chemicus is a specialized abstracting and indexing service that provides comprehensive coverage of newly reported organic compounds and synthetic methods in the chemical literature.
E. CAS Common Chemistry
CAS Common Chemistry is a free online resource from the Chemical Abstracts Service that provides curated chemical information, including identifiers and basic data for commonly encountered substances.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: CAS Registry Numbers
Target entity description: CAS Registry Numbers are unique numerical identifiers assigned to chemical substances, widely used to unambiguously reference specific chemicals in scientific, regulatory, and industrial contexts.

A. Chemical Abstracts Service
Chemical Abstracts Service is a division of the American Chemical Society that provides a comprehensive database of chemical literature and substances, widely used for research and indexing in the chemical sciences.
B. TSCA Inventory of chemical substances
The TSCA Inventory of chemical substances is the official U.S. Environmental Protection Agency list of chemical substances that are manufactured, processed, or imported in the United States for commercial purposes.
C. SciFinder-n
SciFinder-n is a comprehensive research discovery platform from Chemical Abstracts Service that enables scientists to search and analyze chemical substances, reactions, literature, and related scientific data.
D. Index Chemicus
Index Chemicus is a specialized abstracting and indexing service that provides comprehensive coverage of newly reported organic compounds and synthetic methods in the chemical literature.
E. CAS Common Chemistry
CAS Common Chemistry is a free online resource from the Chemical Abstracts Service that provides curated chemical information, including identifiers and basic data for commonly encountered substances.
F. None of above. chosen

Statements (52)

Predicate	Object
instanceOf	chemical identifier ⓘ registry number ⓘ
associatedWith	CAS Registry database ⓘ linked to: Chemical Abstracts Service CAS SciFinder-n platform ⓘ linked to: SciFinder-n SciFinder database ⓘ linked to: SciFinder-n
example	50-00-0 ⓘ 7732-18-5 ⓘ
exampleOf	formaldehyde ⓘ water ⓘ
hasAlternativeName	CAS RN ⓘ CAS Registry No. ⓘ CAS number ⓘ
hasLimitation	different mixtures or grades may have different numbers ⓘ not all possible chemicals have a CAS number ⓘ
hasPartStructure	first part contains 2 to 7 digits ⓘ second part contains 2 digits ⓘ third part contains 1 check digit ⓘ up to 10 digits divided into three hyphen-separated parts ⓘ
hasProperty	assigned sequentially within CAS system ⓘ globally unique per registered substance ⓘ language independent ⓘ not directly encoding chemical structure ⓘ not structurally descriptive ⓘ
hasScope	alloys ⓘ biological sequences ⓘ commercial formulations ⓘ coordination compounds ⓘ inorganic compounds ⓘ isotopes ⓘ metals and alloys ⓘ minerals ⓘ mixtures ⓘ organic compounds ⓘ polymers ⓘ salts ⓘ
maintainedBy	American Chemical Society ⓘ Chemical Abstracts Service ⓘ
standardizedBy	CAS internal rules ⓘ
usedFor	chemical inventory management ⓘ identification of chemical substances ⓘ linking chemical information across databases ⓘ patent searching ⓘ regulatory documentation ⓘ safety data sheets ⓘ scientific literature searching ⓘ
usedIn	environmental databases ⓘ industrial chemical catalogs ⓘ material safety data systems ⓘ pharmaceutical databases ⓘ regulatory agencies worldwide ⓘ toxicology databases ⓘ
usesCheckDigitAlgorithm	modulo 10 weighted sum ⓘ

How these facts were elicited

Referenced by (5)

Full triples — surface form annotated when it differs from this entity's canonical label.

Chemical Abstracts Service → knownFor → CAS Registry Numbers ⓘ

Chemical Abstracts Service → hasPart → CAS Registry database ⓘ

linked to: CAS Registry Numbers

CAS Common Chemistry → provides → CAS Registry Numbers ⓘ

CAS → assigns → CAS Registry Numbers ⓘ

Non-Domestic Substances List → hasTypeOfEntry → Chemical Abstracts Service Registry Number ⓘ