ChEBI
Chemical Entities of Biological Interest (ChEBI) is a freely available dictionary of molecular entities focused on ‘small’ chemical compounds.
PubChem
Chemistry search engine provided by U.S. National Library of Medicine
RSC - Practical Chemistry
Part of the RSC website with links to a collection of over 200 practical activities that demonstrate a wide range of chemical concepts and processes.
Science.gov
U.S. gateway site to search all the science resources , including over 60 databases and over 2,200 scientific websites with access to more than 200 million pages of authoritative federal science information including research and development results.
ScienceOpen
Science open is a freely accessible research network to discover and evaluate scientific information with over 27 million articles and article records.
