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/H2O/h1H2, water

Advanced Search | About ChEBI


Tutorial An introduction to the ChEBI database and ontology, showing users how to search and browse the web/programmatic interface.

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

User Manual Learn more about the data fields in the ChEBI and data sources for 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.



Archived News...

Entity of the month

1st July 2016

While an effective cure for the common cold remains elusive, there is a large market for over the counter cold remedies containing decongestants, that provide some relief from the symptoms. Until 2008 is was possible to walk into a shop on the high street and purchase a cold relief medicine that contained the active decongestant pseudoephedrine. This drug has been used for several decades and has proved to be an effective decongestant, but in 2008 it was placed under tight controls when it became apparent that pseudoephedrine was being used for production of the illicit drug methamphetamine (otherwise known as crystal meth). Since then, pseudoephedrine has been largely absent from shop shelves in the UK, the US and elsewhere.

Read more ...