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

Search for only     All in ChEBI    

Example: iron*, InChI=1S/CH4O/c1-2/h2H,1H3, caffeine

Advanced Search | About ChEBI


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 April 2022

Himastatin (CHEBI:190009), a natural product produced by the soil bacterium, Streptomyces himastatinicus, was first discovered in the 1990s. The compound is known for its antibiotic activity and when tested in animals, it was also found to have potent anticancer activity [1]. The compound is a dimer that consists of two identical subunits (monomers) that are joined together by a bond that connects a six-carbon ring in one of the monomers to the identical ring in the other monomer thus forming a carbon-carbon bond that is critical for the compound's antimicrobial activity. In previous efforts to synthesize the compound, chemists tried to make the carbon-carbon bond first, using two simple subunits, and then added more complex functional groups onto the monomers [2].

Read more ...