Pubchem
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URL = http://pubchem.ncbi.nlm.nih.gov/
= PubChem is an open database of chemical molecules.
Description
"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 substance descriptions and small molecules with fewer than 1000 atoms and 1000 bonds." (http://en.wikipedia.org/wiki/Pubchem)