The IUPAC International Chemical Identifier (InChI, see MIR:00000383) is an identifier for chemical substances, and is derived solely from a structural representation of that substance. Since these can be quite unwieldly, particularly for web use, the InChIKey was developed. These are of a fixed length (25 character) and were created as a condensed, more web friendly, digital representation of the InChI.

Prefix
inchikey
Links
Homepage
Contact
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Pattern for Local Unique Identifiers

Local identifiers in InChIKey should match this regular expression:
^[A-Z]{14}\-[A-Z]{10}(\-[A-Z])$

Example Local Unique Identifier
RYYVLZVUVIJVGH-UHFFFAOYSA-N   Resolve
Pattern for CURIES

Compact URIs (CURIEs) constructed from InChIKey should match this regular expression:
^inchikey:[A-Z]{14}\-[A-Z]{10}(\-[A-Z])$

Example CURIE
inchikey:RYYVLZVUVIJVGH-UHFFFAOYSA-N
Metaregistry

The metaregistry provides mappings between the Bioregistry and other registries. There are 5 mappings to external registries for inchikey.

Registry Name Metaprefix External Prefix
Identifiers.org Identifiers.org logo miriam inchikey
Name-to-Thing Name-to-Thing logo n2t inchikey
Prefix Commons prefixcommons INCHIKEY
Scholia scholia inchikey
Wikidata Property Wikidata Property logo wikidata P235
Providers

Providers are various services that resolve CURIEs to URLs. The example CURIE inchikey:RYYVLZVUVIJVGH-UHFFFAOYSA-N is used to demonstrate the provides available for inchikey. Generation of OLS and BioPortal URLs requires additional programmatic logic beyond string formatting.

Name Metaprefix URI
InChIKey inchikey http://www.chemspider.com/inchikey=RYYVLZVUVIJVGH-UHFFFAOYSA-N
Bioregistry bioregistry https://bioregistry.io/inchikey:RYYVLZVUVIJVGH-UHFFFAOYSA-N
Identifiers.org miriam https://identifiers.org/inchikey:RYYVLZVUVIJVGH-UHFFFAOYSA-N
Name-to-Thing n2t https://n2t.net/inchikey:RYYVLZVUVIJVGH-UHFFFAOYSA-N
Scholia scholia https://scholia.toolforge.org/inchikey/RYYVLZVUVIJVGH-UHFFFAOYSA-N
Extra Providers

Additional providers curated in the Bioregistry are listed here.

Code Name URL
scholia Scholia https://scholia.toolforge.org/inchikey/RYYVLZVUVIJVGH-UHFFFAOYSA-N