UniChem is a web resource provided by the EBI, it is a 'Unified Chemical Identifier' system, designed to assist in the rapid cross-referencing of chemical structures, and their identifiers, between multiple databases. Currently the UniChem contains data from 27 different data sources. Currently UniChem provides links to 108,941,995 structures.

Chambers, J., Davies, M., Gaulton, A., Hersey, A., Velankar, S., Petryszak, R., Hastings, J., Bellis, L., McGlinchey, S. and Overington, J.P. UniChem: A Unified Chemical Structure Cross-Referencing and Identifier Tracking System. Journal of Cheminformatics 2013, 5:3 (January 2013). DOI: http://dx.doi.org/10.1186/1758-2946-5-3

ChEMBL also provide a RESTful Web service that users can use to retrieve data from the UniChem database in a programmatic fashion.

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