PubChem contains information on the biological activities of small molecules. It includes substance information, compound structures, and bioactivity data in three connected databases. Published by the U.S. National Library of Medicine.
SciFinder-n provides access to more than 100 years of chemistry and related science information through the combined coverage of Chemical Abstracts and MEDLINE.
For more than a century, the CRC Handbook of Chemistry and Physics has been a trusted source of reliable scientific data. It contains thousands of physical and chemical data tables which are reviewed and updated on an ongoing basis.