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/CH4O/c1-2/h2H,1H3, caffeine

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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 October 2020

Slugs cause significant damage to plants and crops, particularly cereals, potatoes, and oil seed rape and are regarded as arable farming's number one pest [1]. Metaldehyde (CHEBI:81931) is a cyclic tetramer of acetaldehyde whose crystal structure was first determined in 1936 [2]. It initially found use as a solid fuel firelighter, sold as 'Meta-Fuel' but nowadays, it is used as a molluscicide for the control of slugs and snails in agricultural fields and domestic gardens. It kills slugs and snails by disrupting their ability to produce mucus thereby reducing their digestion and mobility thus making them susceptible to dehydration [3].

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