ChEMBL is a database of bioactive drug-like small molecules, it contains 2-D structures, calculated properties (e.g. logP, Molecular Weight, Lipinski Parameters, etc.) and abstracted bioactivities (e.g. binding constants, pharmacology and ADMET data). It has links to compound records in PubChem and ChemSpider where available. It may be searched by chemical structure or substructure, keyword, target protein sequence (BLAST search) and more. It is produced by the European Molecular Biology Laboratory - European Bioinformatics Instittue (EMBL-EBI).