PubChem

PubChem is a database of chemical molecules and their activities against biological assays. The system is maintained by the National Center for Biotechnology Information, which is part of the National Institutes of Health of USA.

PubChem

Content
Description	Chemistry and the related-biology.
Organism(s)	Human beings and animals.
Contact
Research center	NCBI
Access
Website	pubchem.ncbi.nlm.nih.gov
Download URL	FTP
Web Service URL	PUG-View[1]
Tools
Miscellaneous
License	Public domain

The usage of the database is free of fees.^[2]