Update 2021-02 : this post is still the second-most read post in my blog. Welcome! Some updates: Ammar Ammar in our BiGCaT group has set up a new SPARQL endpoint. Please use and tweet. blog, or otherwise let others now how you use the ChEMBL RDF. Since this post I have blogged a lot more about ChEMBL. Update : this work is now written down in this paper.