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 December 2018
Platinum-iridium alloy

One of the rarer elements in the Earth's crust (~0.01 ppm), platinum is a silvery-white transition metal with atomic number 78 and is located in group 10 of the periodic table (under palladium and sandwiched between iridium and gold). One of the least reactive of the metal elements, it is often found in its elemental form. Its density (21.4 g/cm3) is greater than that of gold (19.3 g/cm3). It was prized by the Mayans for jewellery, but early European explorers regarded it with disdain – it was often present as an impurity when they mined gold.

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