The IUPAC International Chemical Identifier (InChI) is a non-proprietary identifier for chemical substances that can be used in printed and electronic data sources. It is derived solely from a structural representation of that substance, such that a single compound always yields the same identifier.

Prefix
inchi
Keywords
centrally registered identifier chemical descriptor chemical entity chemical structure cheminformatics chemistry knowledge and information systems molecular entity molecular structure
Links
Homepage @inchi_trust
Contact
Missing Contact
Pattern for Local Unique Identifiers

Local identifiers in InChI should match this regular expression:
^InChI\=1S?\/[A-Za-z0-9\.]+(\+[0-9]+)?(\/[cnpqbtmsih][A-Za-z0-9\-\+\(\)\,\/\?\;\.]+)*$

Example Local Unique Identifier
InChI=1S/C2H6O/c1-2-3/h3H,2H2,1H3   Resolve
Pattern for CURIES

Compact URIs (CURIEs) constructed from InChI should match this regular expression:
^inchi:InChI\=1S?\/[A-Za-z0-9\.]+(\+[0-9]+)?(\/[cnpqbtmsih][A-Za-z0-9\-\+\(\)\,\/\?\;\.]+)*$

Example CURIE
inchi:InChI=1S/C2H6O/c1-2-3/h3H,2H2,1H3
Publications
Metaregistry InChI

The metaregistry provides mappings between the Bioregistry and other registries. There are 5 mappings to external registries for this resource with 3 unique external prefixes.

Registry Name Registry Metaprefix External Prefix Curate
BioContext biocontext INCHI
FAIRSharing FAIRSharing logo fairsharing FAIRsharing.ddk9t9
Identifiers.org Identifiers.org logo miriam inchi
N2T Name-to-Thing logo n2t inchi
Wikidata Wikidata Property logo wikidata P234
Providers

Providers are various services that resolve CURIEs to URLs. The example CURIE inchi:InChI=1S/C2H6O/c1-2-3/h3H,2H2,1H3 is used to demonstrate the provides available for this resource. Generation of OLS and BioPortal URLs requires additional programmatic logic beyond string formatting.

Name Metaprefix URI
InChI inchi http://www.chemspider.com/InChI=1S/C2H6O/c1-2-3/h3H,2H2,1H3
Bioregistry bioregistry https://bioregistry.io/inchi:InChI=1S/C2H6O/c1-2-3/h3H,2H2,1H3
Identifiers.org miriam https://identifiers.org/inchi:InChI=1S/C2H6O/c1-2-3/h3H,2H2,1H3
Name-to-Thing n2t https://n2t.net/inchi:InChI=1S/C2H6O/c1-2-3/h3H,2H2,1H3
Extra Providers

Additional providers curated in the Bioregistry are listed here.

Code Name URL
CURATOR_REVIEW InChI through NIST http://webbook.nist.gov/cgi/cbook.cgi?InChI=1S/C2H6O/c1-2-3/h3H,2H2,1H3
ebi InChI through ChEBI https://www.ebi.ac.uk/chebi/advancedSearchFT.do?searchString=InChI=1S/C2H6O/c1-2-3/h3H,2H2,1H3
um InChI through RDF Open Molecules http://rdf.openmolecules.net/?InChI=1S/C2H6O/c1-2-3/h3H,2H2,1H3