CAS Registry Numbers
E205108
CAS Registry Numbers are unique numerical identifiers assigned to chemical substances, widely used to unambiguously reference specific chemicals in scientific, regulatory, and industrial contexts.
All labels observed (2)
| Label | Occurrences |
|---|---|
| CAS Registry Numbers canonical | 2 |
| CAS Registry database | 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 |
Chemical Abstracts Service
ⓘ
surface form:
CAS Registry database
SciFinder-n ⓘ
surface form:
CAS SciFinder-n platform
SciFinder-n ⓘ
surface form:
SciFinder database
|
| 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
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: CAS Registry Numbers Description of subject: CAS Registry Numbers are unique numerical identifiers assigned to chemical substances, widely used to unambiguously reference specific chemicals in scientific, regulatory, and industrial contexts.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
CAS Registry database