Free database of chemical structures of small organic molecules and information on their biological activities
PubChem is a database of chemical molecules and their activities against biological assays. The system is maintained by the National Center for Biotechnology Information (NCBI), a component of the National Library of Medicine, which is part of the United States National Institutes of Health (NIH). PubChem can be accessed for free through a web user interface. Millions of compound structures and descriptive datasets can be freely downloaded via FTP. PubChem contains 162 Millions substance descriptions and small molecules. More than 80 database vendors contribute to the growing PubChem database.
