Chemical Entities of Biological Interest (ChEBI) is a freely available dictionary of molecular entities focused on ‘small’ chemical compounds.

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Example: iron*, InChI=1S/H2O/h1H2, water

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User Manual Learn more about the data fields in the ChEBI and data sources for ChEBI. If you are unable to access the online Google document, please use the FTP link to view our manuals.

Train Online Tutorial An online quick tour (0.5 h) and a more detailed tour (1 h) covering much of the material in the User Manual can be found on the EBI Train Online site here.

Statistics Graphs showing the growth of ChEBI, the numbers of curated, submitted and unchecked entries, the numbers of links to other resources and the sources of the information present in ChEBI



SDF files ChEBI provides its chemical structures and additional data in structure-data file (SDF) format.

Ontology files ChEBI ontology is provided in the W3C standard Web Ontology Language (OWL) and OBO formats.

Database files ChEBI is stored in a relational database and we currently provide the ChEBI tables in flat-file tab delimited format, as an Oracle binary dumps and a generic SQL dumps for MySQL and PostgreSQL database.



Entity of the month

1st March 2018

The first amino acid ever isolated, L-asparagine (commonly known just as asparagine and abbreviated to L-Asn or N, CHEBI:17196) gets its name from the asparagus (Asparagus officinalis) juice from which it was first isolated over 200 years ago by the French chemists Louis Nicolas Vauquelin (1763–1829) and Pierre Jean Robiquet (1780–1840) [1]. One of the 20 standard proteinogenic amino acids, it is synthesised in the body from oxaloacetic acid via L-aspartic acid. Since it does not have to be supplied in the diet, it is classed as a non-essential amino acid.

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