Chemistry and Biochemistry

A free chemical structure database providing fast text and structure search access to over 28 million structures from hundreds of data sources, produced by the Royal Society of Chemistry.

Provides chemical information regarding CAS Registry Number, molecular formula, and molecular weight.

This is the homepage for NCBI. NCBI is a division of the National Library of Medicine. Check out the Resource List and Popular Sources to find data related to gene and genome sequences, information on chemical structures, identifiers, chemical and physical properties, biological activities, patents, health, safety, toxicity data via PubChem, and taxonomy information for over 160,000 organisms.

This webpage holds links to free standards physical and chemical properties and spectral data. For basic information check out NIST Chemistry WebBook.

PubChem provides information on the biological activities of small molecules searchable by compound, substance or bioassay. PubChem includes physical data, drug information, and chemical structure graphics. This database is maintained by the U.S. National Center for Biotechnology Information (NCBI).

Check out the CHIMERA Online Safety Data Sheet Search to find information about the safety of chemical compounds.